If you are a Catholic couple putting off baptism until a baby is several months on, you are wrong, wrong, wrong................
Born with a fallen human nature and tainted by Original Sin, children also have need of new birth in Baptism to be freed from the power of darkness and be brought into the realm of the freedom of the children of God….The Church and parents would deny a child the priceless grace of becoming a child of God were they not to confer baptism shortly after birth. CCC # 1250.
But in respect of the case of the infants, which you say ought not to be baptized within the second or third day after their birth, and that the law of ancient circumcision should be regarded, so that you think that one who is just born should not be baptized and sanctified within the eighth day We [the bishops] all thought very differently in our council. For in this course which you thought was to be taken, no one agreed; but we all rather judge that the mercy and grace of God is not to be refused to any one born of man. St. Cyprian of Carthage. Epist# 58.