Girls, how old were your babies when they were on IV, and what age did…

Girls, how old were your babies when they were on IV, and what age did you stop giving them formula? My baby is 10 months old, breastfed since birth, and now he eats everything: cereals, purees, vegetables, fruits, meat, fish, soups. I give formula only in the morning and before bedtime. Now I'm thinking about replacing the formula with milk porridge or something earlier?