When you smoke you breathe in more than 4,000 chemicals from the cigarette. The smoke goes from your lungs into your bloodstream. That blood flows to your placenta and umbilical cord, right into your baby's tiny body. This causes your baby to struggle for oxygen.
One of the chemicals found in cigarettes is carbon monoxide, a dangerous chemical that gets into your bloodstream. This restricts the supply of oxygen that is essential for your baby's healthy growth and development.
If you smoke during your pregnancy, the nicotine in your blood stream will pass through to your baby, which means when they are born, they will go through nicotine withdrawal. This can make your baby stressed and irritable and it may be difficult to stop them crying.
Smoking while you are pregnant also increases the risk of your baby dying from sudden infant death syndrome (SIDS) by at least 25%.