Prenatal: Occurring or existing before birth.
Prenatal care is the regular health care women should receive from an obstetrician or midwife during pregnancy.
Prenatal development is the growth of a single-celled zygote formed by the combination of a sperm and an egg into a baby.
The word "prenatal" comes from the Latin "pre-," before + "(g)natus," birth = before birth. "Antenatal" is often used in lieu of "prenatal" in the UK, Australia, etc.