"Ah," retort the Baptists. "But doesn’t Jesus say in Mark 16:16 that we must first profess our faith, before we may be baptized? And nobody is able to profess faith, until he or she is old enough to talk!"
No, that is not what Christ here teaches! What Jesus actually states there, is this: "He who keeps on believing, and who has been baptized, shall be saved; but he who does not keep on believing, shall be damned." This means that also babies, as babies, need to believe in Him, with a babylike faith — or otherwise face damnation for the sin they inherit from Adam and also for the sins they themselves commit before their birth.