What is the difference between whole milk powder and skimmed milk powder

Before bringing two children, I didn't study milk powder, only cared about the brand and recipe. It wasn't until this year that the child asked me to buy skim milk to figure out that for example, full milk powder is pork belly, skimmed milk powder is tenderloin, and whole milk powder is more mellow in taste. Skimmed milk powder does not add sucrose, sugar treasure can be drunk, will not increase the burden of the body, children do not have to worry about tooth decay and caries.