There are several substances that can be harmful to a developing fetus. These include:
1. Alcohol: Consumption of alcohol during pregnancy can lead to [Fetal Alcohol Spectrum Disorders (FASD)](). These disorders can cause a range of physical, behavioral, and learning problems.
2. Tobacco: Smoking or exposure to [secondhand smoke]() can lead to premature birth, low birth weight, and increased risk of sudden infant death syndrome (SIDS).
3. Drugs: Illicit drugs such as cocaine, heroin, and methamphetamine, as well as misuse of prescription medications, can lead to a variety of neonatal disorders, including neonatal abstinence syndrome (NAS).
4. Environmental Toxins: Exposure to [heavy metals]() (like lead and mercury), pesticides, and other environmental toxins can impair fetal development and cause congenital anomalies.
