Personally, Id be worried about putting such a young baby on a paleo diet. If only for the reasons that the medical professionals would give you a hard time about it! (They might have the mite taken off you in my country for abuse!)
Also, when he is older, he will probably drift onto a 'normal' diet to fit in with his peers. IMO, its probably better to start on a standard, but healthy diet and once he is old enough to decide for himself, encourage eating paleo style.
This is purely my own point of view, and well not be others!
I'm not a complete idiot! There's parts missing!!