system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does powdered baby formula dissolve perfectly in water, but protein powder (or even chocolate for chocolate milk) usually clump up?
gpt
Baby formulas only like 10-15% protein by weight.  They're about 50% sugar by weight (mostly lactose).  Most protein powders are going to be 70-90% protein by weight.  Lactose dissolves into water much easier than proteins.