Smoking poses risks to a developing baby.
Every time you inhale, the chemicals from the cigarette go into your lungs, into your bloodstream and across the umbilical cord into the developing fetus. As few as five cigarettes a day can cause problems for your baby. Studies have shown that babies born to women who smoked during pregnancy don't weigh as much as they should. You also run a higher risk of having your baby prematurely and having a baby who has more respiratory problems. Avoid secondhand smoke and never let anyone smoke in your house with your baby.