Andrew Huberman· PhD
First of all, oxytocin is involved in the milk, let down reflex, lactation. This makes perfect sense, there needs to be a cue by which the suckling on the nipple of the infant causes the release or let down of milk, and milk let down and lactation is controlled by prolactin, another hormone, but also oxytocin. Oxytocin is also involved in uterine contraction during childbirth, it's involved in cervical dilation to allow the baby to pass out of the birth canal.