My ds is now 11mths and was the same. She still now doesnt eat much. I try to give her as much formula as I can to fill her up. She doesnt sleep through. She weighs around 19lbs 80z now. She too will have baby cereal then 5oz of formula, I try to give her snacks in between but she's not that much interested. Then for lunch half jar of food, 5oz formula, I always try to squeeze in some dessert like rice pudding or egg custard, then at nite she'll have some homecooked food, usually thats a fight and I sometimes revert to cereal again coz she dont want her food, try in some dessert again or mashed banana, and again 5oz of formula. Thats about what she'll eat.
She wont eat bits tho, so whatever I give her for snacks like biscuits, she'll just bite and spit it out again. So not helping lol. But I tell myself that when she's hungry, she'll eat. They wont starve themselves, so dont worry too much about it.