Still not eating a lot

My LO is 11 months (corrected age is 9½ months) we've been doing blw since he was about 7 months as he wasn't ready at 6 months. He's still not eating a lot and still spits most of it out. I thought maybe he'd be better with mashed foods etc but he spat all that out too. I'm worried he's not getting enough to eat. He's gaining weight still and having plenty of wet and dirty nappies throughout the day, but he doesn't seem to actually eat anything. I did blw with my middle child and he was such a foodie and ate loads pretty quickly.