It is also known as crib death. A mother who is pregnant that has never smoked or is frequently around smoke can put their baby at risk or health problems. Some risks are miscarriage, lower birth weight, and premature birth. Due to those issues babies have a higher chance of catching an infection to those babies that are not around second-hand smoke. Babies who are around second hand smoke from their mother, their father, or anyone else after they are born are more likely to die of SIDS than children who are not around second hand smoke (surgeongeneral.gov).
Ways to prevent SIDS are not have the infant around smoke, the mother doesn't smoke at all, or have them sleeping on their stomachs. As many as 21 children may die each year from SIDS that is related to second-hand smoke (Second Hand smoke and children's health). With that being said not all infants die from SIDS but can still show birth defects such as heart defects. Many people say second hand smoke doesn't cause cancer which they are right but also wrong. Second hand tobacco smoke has the same cancer causing chemicals that smoker inhale. However, may actually be higher chemical concentration then