Effects of smoking on your baby

When you smoke your baby does too.

Every cigarette contains 4,000 chemicals, which go into your lungs when you smoke. Once they've gone into your lungs, the nicotine, poisons and carbon monoxide cross the placenta to the baby.

Nicotine narrows your blood vessels, which reduces the blood flow in the placenta. Less blood means less oxygen and nutrients reach the baby and because of this they may not grow as well as expected. Babies born to smokers tend to weigh less at birth than babies born to non-smokers.

Get help to stop smoking


More on smoking and pregnancy


  1. NHS Choices [accessed 28/04/2015] Smoking and pregnancyhttp://www.nhs.uk/conditions/pregnancy-and-baby/pages/smoking-pregnant.aspx
  2.  RCP 2010, Passive Smoking and Children,https://www.rcplondon.ac.uk/sites/default/files/documents/passive-smoking-and-children.pdf  
  3.  Smoking in Pregnancy: Communication with Women Working Group (2015) Shared key messages


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    Last reviewed on October 1st, 2016. Next review date October 2nd, 2019.

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    Please note that these comments are monitored but not answered by Tommy’s. Please call your GP or maternity unit if you have concerns about your health or your baby’s health.
    • By ANGIE JOHNSON . (not verified) on 10 May 2019 - 20:38

      I have a baby in Nashville Tennessee Center ,

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