Which would you prefer:
1. A loli who pees a normal amount and wears thin diapers or pull-ups so she needs changing every couple of hours. She'll need to carry spare diapers and wipes everywhere she goes, and she'd better get used to being changed on public changing tables or even park benches.
2. A loli who pees a normal amount but wears super thick diapers, so she only needs changing once a day. You could change her in the morning before school so she's maximally soggy and squishy by bedtime, or you could be a little bit mean and schedule her change for right after she gets home from school each day.
3. A loli whose body has been engineered or cursed to produce a lot more pee than usual. She'll be emptying her full bladder every 10-15 minutes and even the thickest diapers will need changing every hour or two.