Formula fed babies.

How many ounces of formula do your 9 month olds eat a day? I've read that my 9 month old should only be drinking 16-24 ounces a day but my daughter's drinking about 36-40 and eating table food and she is by no means fat. She just had an appointment and is in the 60% for weight. Do your guys 9 month olds still eat a decent amount of formula?