One of the best things you can do to give your child a healthy start in life is to stop smoking while pregnant.
Smoking and your unborn baby Protecting your baby from tobacco smoke is one of the best things you can do. Although quitting smoking can be difficult, it is never too late.

Over 4,000 chemicals are in every cigarette, so smoking while pregnant can harm your unborn child. Smoking cigarettes can make it harder for your baby to get the oxygen it needs. As a result, every time you smoke, their heart must beat faster.
Benefits of quitting smoking while pregnant Quitting smoking will immediately benefit both you and your unborn child. Your body will eliminate harmful gases and chemicals, including carbon monoxide. After quitting smoking:

You will have a lower risk of complications during pregnancy and birth; you will also be more likely to have a healthier pregnancy and a healthier baby; you will have a lower risk of stillbirth; your baby will have a lower risk of being born prematurely and having to deal with breathing, feeding, and health issues that come with being born prematurely; and your baby will have a lower risk of being born prematurely. Smokers’ babies weigh an average of 200 grams (approximately 8 ounces) less than other babies, which can complicate labor and delivery. For instance, they are more likely to have difficulty keeping warm and to contract infections. By lowering your risk of sudden infant death syndrome (SIDS), also referred to as “cot death,” you will reduce the likelihood of this happening.

Your baby will benefit from quitting smoking later in life as well. Asthma and other serious illnesses in children whose parents smoke are more likely to require hospital treatment.

Better if you quit smoking as soon as possible. But this will be good for you and your baby even if you stop in the last few weeks of your pregnancy.
Your baby can be harmed by secondhand (passive) smoke If you smoke, your partner or anyone else who lives with you can have an impact on you and your baby before and after they are born. If someone around you smokes, it might also be harder for you to stop.

Additionally, your baby’s birthweight can be decreased and the risk of sudden infant death syndrome (SIDS), also known as “cot death,” can be increased by inhaling secondhand smoke. Babies whose parents smoke are more likely to have pneumonia and bronchitis in their first year of life.