Jack didn't get TT until he was three, he started preschool in nappies and within a month he was completely TT for him it just took seeing all the other kids.
Caprece is 2 and a half and has been TT for a while but she is a totally different child and I did nothing different, just waited until she was ready. So yeah I know how stressful it is when it seems like they just won't get it, but they do get there