my one month old has 2 lump/knots. One is on top of his knee and one is behind his right knee..One bigger than the other but both smaller than a pea size...its sort of hard but not red. My husband thinks it is a bug bite buts its hard? Plus it doesnt have a white head on it. i just changed his formula about a week and a half ago He acted fine with it to begin with but not he acts like it hurts his tummy. Does this possibly have something to do with it? Is he possibly getting too much calcium and thats what the knots are or should I be worried?? Please help.