R..
I was always told by my pediatrician that you give them their normal amount of formula (for me, it was nursing because I breastfeed... but it's the same rule...) as normal. Then you can wait about an hour, and offer a 'solid' food 3x a day. Let them eat as much as they want as far as that's concerned. My DD is turning 1 year old next week, and her feeding schedule (that we have been doing since she was roughly 6.5 months) is:
8:00-9:00am wakeup, nurse
10:00am Breakfast (usually fruit, or fruit and cereal)
12:00pm Nurse, nap
2:00pm(ish) wakeup, Lunch (usually veggies)
5:00pm Nurse
6:00pm Dinner (usually veggies with whatever we are having for dinner)
8:00pm Nurse, Bed
1:00am Nurse
~Rinse and repeat. :)
My pediatrician told us that once she hits that 1 year mark, we can start replacing nursing sessions with a snack and cup of cow's milk. But up until that one year mark, breast milk (or formula) needs to be their main source of nutrition.