my DD has (well is offered) 4 bottles during the day (usually 6am 10am 2pm and 6pm) i make up 150ml but she takes anywhere from 80-120mls...so shes only having about 400ml a day but eats everything i put in front of her (shes doing baby led solids). i worry too but the CHN said if shes happy and has wet nappies its all good.

cows milk is hard for a baby to digest (people arent sposed to drink cows milk at all) and doesnt contain all the vitamins etc that a baby gets from formula/BM

HTH