Panic beginning to set in, 3.7 DS will only go in pullups, mostly refuses to even sit on a toilet/potty. Doesn't seem to know if he needs to go. Been trying for nearly 18 months both at home and full time day nursery. Really worried he won't be dry for school in September. Delayed speech (glue ear) probably didn't help with understanding. Don't know whether to contact health visitor/doctor yet? Any advice gratefully received!