My first son, my oldest, is two and has started to have some really awful tantrums, this latest one he banged his head against the crib, and kicked and screamed so loud on the floor for almost 20 minutes. I'm not sure if this is normal or not. I filmed part of it so I can show the pediatrician, but in the meantime I'm worried and a bit bummed. DH and I are good, loving parents, I can't figure this out. Not sure if this is normal or not.