They don't do that consciously (with an agenda). Infants are just being infants. If an AI just needs to keep doing AI things to "reprogram" itself, then theres no barrier for it to do that.
Infants also don't survive by themselves. Leave an infant alone and it will die.
im just saying that infants are learning a whole lot without consciously making an effort to do so. they just provide data through their sensors by existing.