Exposure of young infants to environmental tobacco smoke: breast-feeding among smoking mothers.
M A Mascola,
H Van Vunakis,
I B Tager,
F E Speizer and
J P Hanrahan
Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston 02114, USA.
OBJECTIVES: This study examined the degree to which breast-feedingand cigarette smoking by mothers and smoking by other householdmembers contribute to the exposure of infants to the productsof tobacco smoke. METHODS: The subjects were 330 mother-infantpairs derived from a cohort of 1000 pairs enrolled in a longitudinalstudy of the pulmonary effects of prenatal and postnatal smoking.The main outcome measure was corrected urinary cotinine levels.RESULTS: Urinary cotinine levels were 10-fold higher in breast-fedinfants of smoking mothers than among bottle-fed infants ofsmoking mothers. Among infants of nonsmoking mothers, urinecotinine levels were significantly increased in infants livingin homes with other smokers; in this group there was no significantdifference between bottle-fed and breast-fed infants. Infantswhose mothers smoked in the same room as the infant had onlynonsignificant increases in cotinine levels compared with infantswhose mothers restricted their smoking to other rooms. CONCLUSIONS:Breast-fed infants of smoking mothers have urine cotinine levels10-fold higher than bottle-fed infants whose mothers smoke,suggesting that breast-feeding, rather than direct inhalationof environmental tobacco smoke, is the primary determinant ofcotinine levels in infants whose mothers smoke.
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