Purified stand in present of the Lord

Leviticus 12:1~8
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. On the eighth day the boy is to be circumcised. Then the woman must wait thirty-three days to be purified from her bleeding.
Woman who gives birth to a daughter will be unclean two weeks and she must wait sixty-six days to be purified from her bleeding.
The rule of strict cleanliness in all sexual matter's good to all sexual matters was positive safeguard to health.
Why?
The  difference in time for a son and a daughter probably due to the believe that there was longer discharge of blood after a
 daughter.
It is not the birth but discharge which make 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. On the eighth day the boy is to be circumcised. Then the woman must wait thirty-three days to be purified from her bleeding unclean in term of offering purity of worship to God with no pollutant.
In Christ such disqualification no longer signify. His perfect sacrifice render the believing man and woman forgiven and fit to stand in his present at any time.
How?
Christ is the Lord, let us could be purified before the God through his blood.