They all get turn into a baby why does this happen

Dean

I wake up with cas crying I try to ask him why he was crying but he a baby he can't talk I was that he pee himself so I told sam to change him but he was still crying Bobby came and told me and sam that he was probably hungry or he wants Gabriel to play with him me and sam saw Gabriel was a baby too so we give Gabriel to cas so they can play they were so cute I said to Sam Sam agreed with me and then Gabriel look at sam said give me candy now Sammy!