Leviticus 12:2
"Say to the Israelites, 'A woman who becomes pregnant and gives birth to a son will be unclean for seven days, as she is during the days of her menstruation.

Leviticus 12:4
The woman shall continue in purification from her bleeding for thirty-three days. She must not touch anything sacred or go into the sanctuary until the days of her purification are complete.

Leviticus 12:6
When the days of her purification are complete, whether for a son or daughter, she is to bring to the priest at the entrance to the Tent of Meeting a year-old lamb for a burnt offering and a young pigeon or a turtledove for a sin offering.