I understand the paranoia that comes with being a dxd parent, but honestly, He sounds much like my daughter, nephew,great nephew and most other kids I know that age. I wouldn't worry about it just yet... Please don't project your fears onto your son and look for signs that somethings wrong with him. His personality isn't even yet fully formed. We shouldn't want to medicate and treat every little quirk, Just enjoy him, and his enthusiasm btw, I met a 4y.o girl Tuesday at the beach, Hayley, she cheers at EVERYTHING, I thought it was cute, not ill.