To add to Susan's post, I was too scared to move up to fuzzies for a while as I couldn't get small fuzzies and to me the jump looked too big. So I fed multiple pinkies for a number of weeks to get him used to bigger meals and to ease my own fears!
Aside: he's turned out to be a monster, but is all muscle, so I would not consider this 'blip' in his childhood a factor!