Do you believe all babies are innocent?!
This is about a particular person, not all infants. Don’t you agree?
Sure. But this is the same particular person ie David that also said ...
Psalms 51:5 (KJV) Behold, I was shapen in iniquity; and in sin did my mother conceive me.
So these verses are symbolic of something else than an actual baby. I would say they are the sin or blessings of an adult at any one time.
Psalms 22:9 (KJV) But thou art he that took me out of the womb: thou didst make me hope when I was upon my mother's breasts.
I would say all babies are innocent before God until they understand natural revelation or more. Then they all become guilty.