Babies, many people agree, are pretty interesting. Not because of their personalities (although, to be sure, some babies are great wits), but because of everything going on in their little baby brains. The complex and intricate processing power of an adult brain is literally taking shape within a newborn’s head, as experiences and sensory input forge new neural connections. And if a baby is missing one of those senses — say, hearing — it’s reasonable to think her brain would look and act a l