Substance abuse during pregnancy can have serious consequences for both the mother and the developing fetus. Substance abuse can cause miscarriage, stillbirth, premature birth, low birth weight, and a range of physical, developmental, and behavioral problems in the child. Additionally, substance abuse during pregnancy can lead to neonatal abstinence syndrome (NAS), a condition in which the baby experiences withdrawal symptoms after birth. It is important for pregnant women to seek medical help and support to overcome substance abuse and ensure the health of themselves and their unborn child.