Skip to content

    Health & Baby

    Font Size

    Smokers' Babies Take on Cotinine

    Nicotine Byproduct Found in Urine of Infants Whose Parents Smoke Cigarettes
    WebMD Health News
    Reviewed by Louise Chang, MD

    June 19, 2007 -- The chemical traces of cigarette smoke may show up in babies of parents who smoke, according to a new study.

    The study shows that cotinine, a chemical released when the body breaks down nicotine, is more abundant in urine samples from smokers' babies than from nonsmokers' children.

    It's not clear how cotinine levels affect babies, but exposure to tobacco smoke isn't healthy, note the researchers, who included Mike Wailoo, MD, FRCP, a senior lecturer in the child health department of England's University of Leicester.

    Wailoo and colleagues analyzed urine samples from 104 babies who were about 10-12 weeks old.

    Most of the babies -- 68% -- had at least one parent who smoked cigarettes.

    Overall, 62% of the babies had mothers and fathers who smoked. Eighteen percent only had a mother who smoked. The remaining 20% only had a father who smoked.

    Those parents smoked 16 cigarettes per day, on average.

    The babies of parents who smoked had cotinine levels that were more than five times higher than babies of nonsmoking parents.

    Maternal smoking had the biggest effect, quadrupling the babies' cotinine levels. Paternal smoking nearly doubled the babies' cotinine levels.

    "Our findings clearly show that by accumulating cotinine, babies become heavy passive smokers secondary to the active smoking of parents," write the researchers.

    They note that it's up to parents to decide not to smoke around their children. "The well-recognized maternal desire to protect the child is the great hope for the future," Wailoo's team writes.

    Baby's First Year Newsletter

    Because every week matters, get expert advice and facts on what to expect in your baby's first year.

    Today on WebMD

    mother on phone holding baby
    When you should call 911.
    parents and baby
    Unexpected ways your life will change.
    baby acne
    What’s normal – and what’s not.
    baby asleep on moms shoulder
    Help your baby get the sleep he needs.

    mother holding baby at night
    mother with sick child
    Chinese mother breast feeding newborn baby girl
    Track Your Babys Vaccines
    Baby Napping 10 Dos And Donts
    Mother with her baby boy
    baby in crib
    baby gear slideshow