Jack's 3rd tooth has broken through...at the bottom next to his middle bottom left. Normally the top 2 next after the first 2 isn't it? I think OH and family were the same though, so much be a genetic thing
My DD had her first tooth on the bottom, too! My dentist said this was completely normal, as kids get their first teeth in all sorts of different spots. I'm glad Jack's doing well. They grow up so fast!