How old is it?

A young boy about 6-7 approached me last night at a t-ball game. I was just sitting there with me and TJ enjoying my pretzel covered in cheese. He looked at TJ and said to me, "How old is it?" I was a little taken aback and replied, "He is seven months old." The boy then elaborated, "I have one too, it is three days old, it is right over there, see? I don't like it." I asked dutifully if "it" was a brother or a sister. He replied, "It is a girl." and then for emphasis, "I don't like it." I told him I thought when she got a little older and he got used to having a sister he would see it was a lot of fun. He looked at me as if I had grown a second head, and walked away.