A couple of times, Sadie -- the middle child -- came over and started dancing with Max, waving her arms and grinning. He just stood there, amused (I think he could really get used to having girls dance around him).
You are in the diaper aisle. The far end where they keep the biggest diapers. The frown on your face tells me you are discouraged that they stopped at size six. Your boy can barely squeeze into them and they are useless through the night. I only recently left the diaper aisle myself.
People accept an 8-year-old who still acts 6. They are just "young for their age." They will tolerate a 10-year-old who still acts 6 if the parent looks exhausted enough. But a 13-year-old who is still acting like a 6-year-old is a serious social problem. I know, because this child is my son.