I'd say he's a bit young for fuzzies unless he's grown unusually fast. If the pinky is still leaving a visible lump in him after he's swallowed, then he's fine on those for a while.
When he gets to the point that he swallows a pinky and it doesn't give him a visible lump after swallowing, try feeding two pinkies at a time for a couple of weeks, then try three.
When he can take three pinkies at a time (and keep them down), try a fuzzy then.