Once again let me state I am no expert. I am a beginner also. Jake is a little over 2 months old and 16 1/2 inches long. I started giving him fuzzies last week.
He took his second yesterday. When the "lump" is not very noticable or your snake is out and about soon after feeding, then it is time to move up. According to everything I have read on this excellent forum, fuzzies are more nutritional then pinkies. I hope this helps. I am sure someone else with more experience will chime in with hopefully better info. :cheers: