Vaginal Birth

Vaginal birth occurs when a male either grows a vagina, due to a "magical" pregnancy, or if the male in question is transgender, and was therefore born with the necessary parts for pregnancy.

Biological Explanation
For a "magical pregnancy", it is generally assumed that the pregnancy is caused by a potion, spell, or other such external, magical cause, that is non-traditional of pregnancy. Said external force would alter the body's makeup to cater to the pregnancy, such as The growth of the vagina may cause slight pain, but is generally just uncomfortable.
 * Creating a uterus
 * Making the body appear more feminine externally
 * And creating a vagina for the delivery of the child