What is the difference between the terms, antanatal, prenatal, and perinatal?

Confusing: Antenatal = events occurring during pregnancy but before birth ('antenatal testing') prenatal = same as antenatal basically ('prenatal vitamins') perinatal = basically the same as above as well, with some overlap with 'postnatal' (perinatal ultrasound).

Antanatal: Antanatal- after birth, prenatal - before birth, perinatal - around birth.

Just like the prefix: Antenatal means before birth, so is prenatal. Perinatal means around birth. Postnatal means after birth.

Hope this helps: Perinatal = timeperiod 5 months prior to 1 month after birth prenatal = same as antenatal antenatal = time-period up to but not including birth.