Ooh how exciting! What exactly do you mean though - did you buy unweaned babies, did you buy young parrotlets, or did your parrotlets have babies? Either way congrats! I love parrotlets, and I currently have one
If your pair of parrotlets did have babies however, I would just recommend that you leave them with the parents unless you actually
want to hand feed them. But make sure to socialize them! (later of course, newborns just need to sleep and eat, but once they are a bit bigger you want them to be friendly)