Before I begin, know this: infant baptism is NOT a made up doctrine of any particular Church!!
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Jesus invited the little children to come to Him, through THEIR PARENTS.
Mat. 19[14] But Jesus said, Suffer little children, and forbid them not, to come unto me: for of such is the kingdom of heaven.
The word "suffer" in the KJV means to "permit/allow" them to come to Jesus.
The word "little" means "infants".
This is sound biblical doctrine for "infants" TO COME, or be brought by the parent(s) to Jesus.
Therefore, all believing parents especially, should comply with the desire/will of Jesus!!
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OT scripture supports this, but it is applied erroneously to the FALSE doctrine of a "one thousand year reign on the earth, AFTER Christ returns", aka by the "religious" term, "THE" Millennium.
Isa. 65[20] There shall be no more thence an infant of days, nor an old man that hath not filled his days: for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed.
> for a better understanding, of the application and meaning of Isa. 65:20, see Isa. 55:8-9 and John 16:13.
This should help you to also better understand WHEN and HOW the period of WHAT "a thousand years" IS or means. See 2 Peter 3[8] But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
IT MEANS NOW, ever since The Day of Pentecost!!