The time to stop drinking is when you are planning a pregnancy. Because you don’t know precisely when you might conceive, It’s best to avoid alcohol when you are sexually active and not using contraception. If you wait until you know you are pregnant, you may be risking damage to the embryo during the first trimester. That is when the cellular structure of the limbs and organs are being formed. As well, the neuropathways of the brain and the central nervous system (CNS) continue to develop throughout the nine months of pregnancy. This process does not stop after birth so it is wise to continue to avoid alcohol if you are breastfeeding.