You can safely drink alcohol and still breastfeed your baby as long as you wait the right amount of time before nursing. In the meantime, you can give your infant stored breastmilk or formula. But there are other reasons to limit your intake when breastfeeding Studies suggest that drinking two or more alcoholic beverages a day can reduce your milk supply. This is because alcohol can negatively affect the production of prolactin. This is the hormone that triggers the body to produce milk. If you are breastfeeding, you should avoid having more than one glass of alcohol a day. If you need help for an alcohol addiction (alcohol use disorder), your doctor can recommend treatment programs or support groups.