I shook my head, because there's no need for them, and I think they're just another disgusting attempt at marketing to sexualize our daughters too early. Toddlers don't have boobs!
I asked one of them why it was necessary, and she threw a fit saying her daughter likes to run around in just her bottoms in the yard, and she doesn't want perverts to see her nipples. Really? Just make her keep her shirt on then. I'm so over this "every male is a pervert" mentality.
A three year old doesn't need a bra. It's weird.