No you can't. Rare Candy says you can evolve a basic pokemon. The evolved Baby is no longer a basic, it is an evolved basic pokemon. Rare Candy can't be used on it.
Wait... Baby pokemon cards only exists in Neo Series and some promo cards right?
Are you talking about the Basic Baby Cards.
Well, A pokemon that just evolved can't evolve again.
A basic baby pokemon can baby-evo at the turn it is played.