DS has just turned 5 & has been in his hipod booster for a while now. I was using the H harness when he was littler, but it was a PITA, so I gave up. The lap sash belt goes through his seat so its positioned in the right place on his body anyway. It was only recently I found out the H harness isn't all that safe.

I've bought DD3 a safe'n'sound seat that she can use til she's 8. The harness will probably fit til she's over 5, the we remove it & use the lap sash belt.