If you’re in the uk, get onto Bladder and Bowels. They can often supply you with nappies appropriate for your child’s needs. If you’re looking for something in the meantime, Aldi do a pull up style nappy, although it says 3-7? Maybes 3-8 years (I’m not exactly sure which one), my little brother and sister who are 7 (quite skinny) and 6 (quite chunky) can fit into them with no problems and it’s holding wee a lot longer than normal dry-nites. 

dry-nites are no good as they’re supposed to get wet, so the child can feel hat they’re wet and will feel uncomfortable (a way of kind of forcing toilet training so they don’t feel the discomfort of wet pants/nappies). Definitely give Bladder and Bowel a go or you main health professionals can refer you in too. 

Thx you so much 

Thx you so much