4- having a baby is a highly polluting act. To give birth to a girl is twice as polluting as is giving birth to a boy

http://www.biblegateway.com/passage/...12&version=NIV

Leviticus 12
Purification After Childbirth
1 The LORD said to Moses, 2 "Say to the Israelites: 'A woman who becomes pregnant and gives birth to a son will be ceremonially unclean for seven days, just as she is unclean during her monthly period. 3 On the eighth day the boy is to be circumcised. 4 Then the woman must wait thirty-three days to be purified from her bleeding. She must not touch anything sacred or go to the sanctuary until the days of her purification are over. 5 If she gives birth to a daughter, for two weeks the woman will be unclean, as during her period. Then she must wait sixty-six days to be purified from her bleeding.


to be continued