My son will wee in the toilet but absolutely refuses to poo on the toilet (or the potty). He will only poo in his nappy. He's a sensitive boy and gets hysterical if I try to sit him on the loo when he needs a poo. Anyone else experienced this? He's just turned by 4 and I'm so worried that we won't have this sorted by big school. Can anyone help? I'm really feeling upset about this. Thank you xxx