If you do continue to drink you need to avoid dehydration by drinking plenty of water regularly. Your doctor will advise you on this. It is also important that you tell your midwife or doctor as accurately as you can how much you drink so that they can monitor your baby's development. It may be that having one drink occasionally is safe, but in general it is better to avoid using alcohol as much as possible. During the first twelve months of the baby's life the brain is still developing and may be damaged by alcohol.
Alcohol use can reduce the milk supply.