When my son was 4 he had a nursery school teacher who was young and pretty....when I would pick him up he wouldn't come running to me! He would look up at her, blush and smile the goofiest smile you ever saw...all any body could do that was around him was laugh..he looked so cute! And he would just continue to stare at her...didn't evan hear us gaffawing in the backround...wish I had it on tape!!