exposure to tobacco smoke in the perinatal period Environmental pregnant women and thyroid hormone levels in newborn cord blood: A birth cohort in China Light smoking' before pregnancy can
Light smoking' before pregnancy can cause major health problems What effects does smoking during pregnancy have on the baby? Smoking during pregnancy can increase your baby's risk of certain birth defects, like cleft lip or palate. If you are pregnant or thinking of becoming pregnant, quit smoking today. Learn how at How Smoking Impacts Your Pregnancy Secondhand smoke can have negative effects before pregnancy: Study
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