You are more likely to give birth to a baby who weighs less than
expected (low birth weight) if you smoke. This can lead to many medical
problems for your child.
Smoking while pregnant also increases the risk of birth defects, such
as cleft lip and cleft palate.1
Women who smoke also have a higher risk of problems with the
placenta, which nourishes the unborn baby and removes its wastes. This can
cause problems throughout your pregnancy and with your newborn.
If you quit smoking before you become pregnant (or sometime during
the first 3 months of your pregnancy), your risk of having a baby with low
birth weight is the same as that of a woman who does not smoke. Women who quit
later in their pregnancy still reduce the risk of problems for their
babies.