Baptism is one of the seven church sacraments we are reborn and enters into the Kingdom of God.
The Church can baptize any newborn child boy or girl on any day without waiting forty or eighty days if the life of the baby is in danger[Fetha Negest 3].
The forty or eighty day-waiting period is the required time before the mother is allowed to participate in her child’s baptism. For God commanded Moses saying, "If a woman has conceived, and borne a male child, then she shall be unclean seven days; as in the days of her customary impurity she shall be unclean. 'And on the eighth day the flesh of his foreskin shall be circumcised. 'She shall then continue in the blood of her purification thirty-three days. She shall not touch any hallowed thing, nor come into the sanctuary until the days of her purification are fulfilled. 'But if she bears a female child, then she shall be unclean two weeks, as in her customary impurity, and she shall continue in the blood of her purification sixty-six days" (Lev 12:2-5).