The effects of maternal alcohol (ethanol) ingestion during lactation are complex and depend on the pattern of maternal drinking. Alcohol decreases milk production with 5 drinks or more decreasing milk letdown and disrupting nursing until maternal alcohol levels decrease. Beer may increase serum prolactin levels during nursing because of polysaccharides from barley and hops. Women with a family history of alcoholism have a blunted prolactin response following breast stimulation and tend to breastfeed more frequently to compensate.
Breastmilk alcohol levels closely parallel blood alcohol levels. The highest alcohol levels in milk occur 30 to 60 minutes after an alcoholic beverage, but food delays the time of peak milk alcohol levels. Nursing after 1 or 2 drinks (including beer) can decrease the infant's milk intake by 20 to 23% and cause infant agitation and poor sleep patterns. The long-term effects of daily use of alcohol on the infant are unclear. Some evidence indicates that infant growth and motor function may be negatively affected by 1 drink or more daily, but other studies have not confirmed these findings. Heavy maternal use may cause excessive sedation, fluid retention, and hormone imbalances in breastfed infants.
Casual use of alcohol (such as 1 glass of wine or beer per day) is unlikely to cause either short- or long-term problems in the nursing infant, especially if the mother waits 2 to 2.5 hours per drink before nursing, and does not appear to affect breastfeeding duration. Daily heavy use of alcohol (more than 2 drinks daily) may affect infants negatively and appears to decrease the length of time that mothers breastfeed their infants. Nursing or pumping within 1 hour before ingesting alcohol may slightly reduce the subsequent amounts of alcohol in breastmilk.
The alcohol (absolute ethanol) content of various drinks are as follows: 12 fluid ounces of beer (4.5%) = 12.6 g; 4 fluid ounces of table wine (12%) = 11.2 g; 1 fluid ounce of whiskey (100 proof) = 11.7 g. Blood alcohol is often reported as a percent; a concentration of 1 g/L of alcohol is equivalent to 0.1%.
Five nursing mothers drank 0.4 grams/kg of alcohol as vodka (about 2 drinks for a 60 kg woman) over 1 minute after a standard breakfast and followed the drink with 80 mL of water. Blood and milk samples were collected over the next 3 hours. Eight additional women who were not breastfeeding followed the same protocol. Blood and milk alcohol levels had a later peak in lactating women (48 minutes) than in the lactating women (31 minutes). The bioavailability of alcohol in the lactating women was 74% of bioavailability in the nonlactating women; peak blood alcohol concentrations were numerically lower, but not statistically different from the nonlactating women. Milk alcohol levels closely paralleled blood alcohol levels with an average peak level of 0.44 g/L, falling to about 0.35 g/L at 90 minutes and about 0.09 g/L at 3 hours after the dose.
Twelve women between 4 and 41 weeks postpartum drank a 0.6 grams/kg of alcohol (about 3 drinks for a 60 kg woman) as a 15% solution over 5 minutes on an empty stomach. Blood and milk samples were obtained every 30 minutes for 2 hours. Alcohol concentrations in milk closely paralleled blood concentrations with the highest concentration averaging 1.05 g/L at 1 hour after the dose. By 2 hours, the alcohol concentration in milk was 0.7 g/L. Acetaldehyde, the major metabolite of alcohol, was undetectable in milk (assay limit not stated), but was detectable in maternal blood.
Eight nursing mothers with infants ranging in age from 6 weeks to 2 years 9 months rapidly drank from 0.46 to 1.5 grams/kg of alcohol after a small meal. The time of peak alcohol concentrations varied from 1 to 2.5 hours after the initial ingestion of alcohol; however, some of the women drank their alcoholic beverage over a 1 hour period. Both fore- and hindmilk levels closely paralleled blood alcohol concentrations.
Twelve nursing mothers with infants 25 to 216 days of age drank 0.3 grams/kg of alcohol (about 1.5 drinks for a 60 kg woman) in orange juice over 15 minutes in the morning. Prior food intake was not controlled. Milk samples were collected over 3 hours. The average peak level of alcohol in milk was 0.32 g/L at 1 hours after the end of alcohol ingestion. Milk alcohol concentrations were 0.2 g/L at 2 hours and 0.05 g/L at 3 hours after the end of alcohol ingestion. Using the volume of milk taken by the infant at the one nearest nursing time, the authors estimated that a breastfed infant would receive between 0.5 to 3.3% of the mothers weight-adjusted dosage.
Two groups of Mexican mothers were studied after receiving an average of either 0.21 or 0.4 grams/kg of alcohol as pulque after breakfast. Blood and milk samples were taken at 60, 90 and 120 minutes after pulque ingestion. They were exclusively breastfeeding their infants who were 3 to 21 months of age. Milk alcohol concentrations paralleled blood alcohol, with the highest milk levels at the first measurement at 60 minutes after ingestion. The group of mothers who consumed higher doses of alcohol eliminated it more slowly from blood and milk.
A dose of 0.3 grams/kg of alcohol (about 1.5 drinks for a 60 kg woman) was administered over 15 minutes to 23 Chinese nursing mothers in a chicken-based soup following a cereal snack. Samples of blood and milk were taken during the following 135 minutes. The time of peak milk alcohol levels varied among women between 20 and 40 minutes after the dose. Milk alcohol levels were similar to blood levels, but fell slightly more slowly. At 135 minutes after soup ingestion, the average breastmilk alcohol concentration was 9.05 mg/dL. The authors estimated that milk alcohol levels returned to 0 at about 175 minutes after ingestion.
A study compared alcohol pharmacokinetics in 20 lactating women to that in 9 formula-feeding women and 15 nulliparous women. Women were tested twice, once fasting and once after a standard breakfast. Subjects received 0.4 grams/kg of alcohol (about 2 drinks for a 60 kg woman) in 2 doses 5 minutes apart, an hour after the meal on the fed days. Blood alcohol was estimated from breath alcohol levels over a 205 minute period. The average bioavailability of alcohol in the lactating women was 82% of bioavailability in the nonlactating women; peak blood alcohol concentrations in the lactating women were lower than in the nonlactating women, especially than the nulliparous women. Postpartum women, both lactating and nonlactating, felt sedated by the alcohol for a shorter period of time than nulliparous women.
A nomogram was developed using pharmacokinetic principles to estimate the duration of alcohol in milk. The time to eliminate a standard drink of about 12 g of alcohol varied with the weight of the woman. For a 54 kg (120 lb) woman, 2.5 hours after finishing the drink is required to eliminate the alcohol from her milk. For a 68 kg (150 lb) woman 2.25 hours is required ; for an 82 kg (180 lb) woman, 2 hours is required. For each additional drink consumed, the same number of hours should pass. For example, a 150 kg woman consuming 4 drinks should wait 9 hours before resuming breastfeeding to ensure that the infant does not receive any alcohol. A study of 10 women of varying weights who consumed 16 fluid ounces of table wine found general agreement between their results and this nomogram.
Sixteen lactating women who were 3 to 5 months postpartum pumped milk either 1 hour before or 0.6 hours after ingesting 0.4 mg/kg of ethanol. Blood alcohol concentrations were measured several times between 0.4 and 3.4 hours after alcohol ingestion. Each woman underwent this test on 2 occasions, once fasting and once after a meal. Eating before alcohol ingestion reduced and delayed the peak blood alcohol concentrations, and reduced the total alcohol absorption and elimination rate. Pumping before alcohol ingestion caused similar effects, but of a smaller magnitude, and the two effects were additive or synergistic. Milk alcohol concentrations were not measured, but likely paralleled the blood concentrations closely.
A computer simulation of breastfed infant serum alcohol levels after maternal ingestion of 250 mL of wine estimated resulting blood alcohol concentrations of 0.0033% in newborn infants and 0.0038% in 3-month-old infants.
Effects in Breastfed Infants:
A nursing mother was drinking large amounts of quinine wine, wine, champagne, beer and liquors. Her infant had been gaining 30 g of weight daily until he weighed nearly 6 kg at 5 weeks of age. The infant had been restless and sleepless for several days when he suffered from violent fits and tonic-clonic seizures that required medical treatment. After he was taken off the mother's breast and began to be nursed by a wet nurse, his weight quickly dropped by 200 g in 3 days and fell into a pattern of calm sleep.
A similar case of chronic heavy alcohol use by a nursing mother resulted in pseudo-Cushing syndrome in her 4-month-old breastfed infant. The infant had a bloated appearance, excessive wight gain and diminished length for age. The mother reported drinking 50 cans of beer weekly and "generous" amounts of other alcoholic beverages to increase her milk supply. The infant's symptoms resolved and growth pattern returned to normal after her mother stopped consuming alcohol.
A series of 23 cases of severe thrombocytopenia and bleeding were reported among 21- to 60-day old breastfed infants of Chinese women in Singapore over a 5-year period. None of the infants had received prophylactic vitamin K at birth and all of their mothers had been taking alcohol tonics after each meal beginning at 7 to 10 days after delivery which was a common practice among only the Chinese in the mixed ethnic population delivering at the hospital. Most of the infants had also been receiving 5 to 15 mL daily of "gripe water" which had an alcohol content of about 5%. The authors attributed these cases to the lack of prophylactic vitamin K (which was common practice at the time) and increased clottingfactordegradation caused by alcohol.
A woman who drank 750 mL of port wine in 24 hours noticed that her breastfed 8-day-old had a deep unarousable sleep, snoring, pain insensitivity, inability to suck, excessive perspiration and a feeble pulse. These symptoms were attributed to the very young age of the infant and the large amount of alcohol consumed.
In a series of studies, investigators measured the effect of maternal alcohol use on their breastfed infants. In one study, 12 nursing mothers with infants 25 to 216 days of age drank 0.3 grams/kg of alcohol (about 1.5 drinks for a 60 kg woman) in orange juice over 15 minutes in the morning. On a separate occasion, they drank an equal volume of orange juice. In another study, 12 nursing mothers nursing infants with a median age of 150 days drank 0.3 grams/kg of alcohol as beer or the same volume of nonalcoholic beer on a separate occasion. In a third study, 12 nursing mothers with infants averaging 3.1 months of age drank 0.3 grams/kg of alcohol in orange juice over 15 minutes in the morning. On a separate occasion, they drank an equal volume of orange juice In both studies, infants who drank milk that contained alcohol consumed 20 to 23% less milk during the 3- or 4-hour testing session, even though the time spent at the breast and number of sucks was unchanged. Mothers could perceive no difference in milk production or nursing behavior in their infants. Infants sucked more vigorously on a bottle containing their mothers' milk spiked with alcohol than on mothers' milk alone. In a study in which infants were weighed by the mothers before and after each feeding for the next 16 hours (20 hours total), infants increased the number of nursings during the period of 8 to 12 hours after the alcohol intake such that the total amount of milk consumed during the 20-hour period did not differ between the alcohol and non-alcohol days.
In studies that measured infant sleep, infants slept more frequently for shorter periods of time during the 3.5 to 4 hours after alcohol intake, whether it was after mothers drank 0.3 grams/kg of alcohol before breastfeeding or infants were given their mothers' milk spiked with an amount of alcohol (32 mg/100 mL) equivalent to that at 1 hour after maternal ingestion of 0.3 grams/kg of alcohol. After ingesting the alcohol-containing milk after maternal consumption of 0.3 grams/kg of alcohol, 14 infants from 4 to 11 weeks of age infants were observed for 1 hour after milk ingestion. Their behavioral state changed more frequently, they slept less, cried more and startled more than after consuming milk without alcohol. Mother-infant interactions were more conflictive after alcohol intake which may partially explain increased infant arousal after maternal and infant alcohol ingestion. A study that monitored the infants during the 24-hour period after maternal alcohol ingestion revealed that the infants compensated by spending more time in active (rapid eye movement) sleep from 3.5 hours to 24 hours with no further alcohol intake.
Long-term effects of alcohol ingestion during breastfeeding were studied in 2 separate populations by one group of investigators. In the first study, alcohol intake of more than 1 drink daily during nursing produced a measurable decrease in motor function development, but not mental development at 1 year of age. A later follow-up study found no decrements in performance of 18-month-old infants who were breastfed by mothers who consumed alcohol.
Studies have examined the effects of ingestion of pulque, an alcohol-containing drink made from agave cactus, in rural Mexican women. Most of the women had ingested pulque daily during pregnancy and lactation. One study found no effects on weight or length growth velocity among the 32 infants at 3 and 6 months of age whose mothers ingested an average of about 30 g of alcohol daily compared to the infants of 62 infants who did not drink pulque. Another study compared the growth of 40 infants whose mothers ingested pulque during lactation and 18 whose mothers did not. Mothers who consumed pulque ingested an average of 16.3 g daily. The infants whose mothers ingested pulque regularly had poorer growth between 1 and 57 months and smaller size at 57 months.
A retrospective study of 222 inner city women reported only as an abstract found that 1-year-old breastfed infants scored higher on language skills and motor development and had fewer hearing problems than nonbreastfed infants. Alcohol use by the mothers did not decrease the beneficial effects of breastfeeding.
Possible Effects on Lactation:
Studies in mothers who were 2 to 8 days postpartum found that acute doses of alcohol infused intravenously reduced the oxytocin-mediated milk ejection reflex following infant sucking. The effect could be overridden by administration of exogenous oxytocin, indicating that alcohol inhibits oxytocin release, not its effect on the breast. Alcohol doses of 0.5 to 0.99 grams/kg reduced oxytocin response to infants sucking by 18%; doses of 1 to 1.49 grams/kg reduced the response by 62%; and doses from 1.5 to 1.99 grams/kg reduced the response by 80%. Alcohol also increased the time for letdown to occur after nipple stimulation, from 29 seconds to 64 seconds with doses of 1 to 1.49 grams/kg and from 38 seconds to 331 seconds with doses of 1.5 to 1.99 grams/kg. Other investigators found that drinking 100 mL of whiskey containing a total of 50 mL of absolute alcohol (about 4 drinks in a 60 kg woman) abolished the rise in serum oxytocin in response to breast stimulation with a breast pump in 16 nonpregnant, nonlactating women. Pretreatment with naloxone blunted alcohol's inhibitory effect on oxytocin release.
Acute alcohol ingestion can either increase, decrease or have no effect on serum prolactin in nonpregnant, nonlactating women.
Drinking 100 mL of whiskey containing a total of 50 mL of absolute alcohol lessened the increase in serum prolactin in response to breast stimulation with a breast pump in 11 nonpregnant, nonlactating women. Serum prolactin rose by 71% over baseline 20 minutes after stimulation without alcohol and only by 25% after alcohol consumption. Pretreatment with naloxone blunted alcohol's inhibitory effect, with the combination resulting in a 46% rise in serum prolactin over baseline. It is not clear how these finding apply to lactating women.
A study on 30 lactating women who were 2 to 4 months postpartum found that the normal rise in serum prolactin was enhanced when alcohol in a dose of 0.4 g/kg was taken 35 minutes before breast stimulation with a breast pump. In subjects with a first-degree relative who was alcoholic, the increase in serum prolactin was less than in other subjects, both with and without prior alcohol consumption.
Nursing mothers who ingested a 0.3 grams/kg dose of alcohol produced an average of 9.3% less milk 2 hours after the alcohol intake using a breast pump than they did when a nonalcoholic beverage was taken. The caloric content and composition of milk were not different during the two test periods.
A 1-year long survey of 587 new mothers in Australia found that women who drank more than 2 standard drinks (10 grams or 12.5 mL of absolute alcohol) daily were twice a s likely to discontinue breastfeeding by 6 months postpartum.
Beer specifically has a reputation for increasing milk supply. A small crossover study found that ingestion of 1 liter of beer containing 6% alcohol by 11 nonpregnant, nonlactating women increased serum prolactin by nearly 2.5-fold 30 minutes after ingestion, but sparkling water with an equivalent amount of alcohol did not. In another study, 7 nonpregnant, nonlactating women were give 800 mL of beer. Six drank beer containing 4.5% alcohol and 1 woman drank nonalcoholic beer. Their average peak serum prolactin increased to 2.4 times the baseline value between 60 and 105 minutes after ingestion. The one woman who drank nonalcoholic beer had an equivalent prolactin response. Pretreatment with naloxone had no effect on the prolactin response. Studies in animals indicate that a polysaccharide found in barley and malt is apparently responsible for the increase in prolactin after beer ingestion.
The interaction between alcohol ingestion and breast pumping was investigated in a double-blind crossover study of 13 lactating women who were exclusively nursing 2- to 5-month-old infants. Compared to placebo, ingestion of 0.4 mg/kg of alcohol increased serum prolactin during the ascending phase of blood alcohol concentrations. Pumping milk from the breasts during the ascending phase of blood alcohol enhanced the prolactin response, but pumping during the descending phase of blood alcohol blunted the prolactin increase. Milk production was lower after alcohol ingestion, but unrelated to serum prolactin or alcohol blood concentrations.
Twenty-three Taiwanese nursing mothers received a chicken-based soup following a cereal snack twice during the first 15 days postpartum. On one occasion the soup contained a dose of 0.3 grams/kg of alcohol (about 1.5 drinks for a 60 kg woman) and on the other occasion the soup was alcohol free. The time for the first drops of milk to be ejected was longer (2.9 vs 4.4 seconds) after the alcohol-containing soup than with the nonalcoholic soup. In addition, the triacylglycerol (14.8 vs 12.3 mg/dL) and lactate (0.8 vs 0.6 mg/dL) content of breastmilk were greater at 135 minutes after ingesting the alcohol-containing soup than the nonalcoholic soup.
A study compared the prolactin response of 7 non-alcohol-dependent women with a family history of alcoholism to 21 women with no family history of alcoholism. Participants were given a dose of 0.4 g/kg of alcohol or placebo in a crossover fashion on 2 days. A breast pump was used to collect breastmilk beginning 35 minutes after ingesting the test solution. Blood samples were collected for prolactin before and at various times after beverage consumption. The women with a family history of alcoholism had reduced serum prolactin responses to breast stimulation whether or not they had consumed alcohol. They tended to nurse their infants more frequently than the other mothers, apparently as a method of compensation.
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