How often to change nappy of 9 month old

She is EBF with cerelac solids. And her poopie is now more like that of an adult ie brown sticky, and smelly not that cute nice yellowy lentil fresh-yoghurt-smelling poop.

The nappy quantities as the size go up has reduced, so I think I’m supposed to change less, but just want to make sure and not give her any UTI’s etc. I used to change every 3-4hrs, but I’m noticing them being less full/heavy lately. Any time she poops, I change immediately , so I’m asking about when she’s done a number one

Edit: I’m using nappy pull on pants.