I personally feel a rat fuzzy or pinkie is too big for a baby ball python. I start my babies off with mouse hoppers for the first month or two, then move up to small adult mice for another month or so, then start them on rat fuzzies and move up as they grow. At about 150-200g they should be ready for rat fuzzies or pups. Most of the literature i've read says rats are better nutritionally than mice.