tugging at nappy 18 months

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been doing this for a while so dont think cystitis - others experience this with their little boys???

is it hinm feeling sensation of horrible wet nappy clinging to his willy?

tuggs and pulls it away from him a lot in day

My DS (20months) does this too, and I think it's because he's aware when he's having a wee. Might be worth thinking about getting a potty, as if he's conscious of getting his nappy wet or dirty then he could be ready to be introduced to what a potty is and what it's for.
You might get some more ideas on the potty training thread but that's my suggestion!