Feeding and milestone

My girl sit unsupported at around 8mo, but I think can’t sit for very long. Babies at that age don’t eat a lot of solid food. Milk is their main source of nutrients and solid food is just to taste, learn to chew/swallow & test allergy only. However, my girl ifc replace 2 of her milk feed with solid food (lunch & tea break) at 9mo and she eat very well. Now shes 13mo, and she’s a foodie