My supply is slowly dropping and my pumping can't keep up with what AJ drinks during the day with the sitter. I'm only at work 2 days a week and my supply seems to meet his needs on the other 5 days a week. But, now I'm looking at supplementing 2 bottles a week. I read the back of the formula can and it is 99% non fat milk, oil, whey and lactose. So, if a can of formula is mostly cow's milk anyway, why can't I just give him cow's milk? I understand that if he was on a diet of solely formula he would need all the extra vitamins and minerals, but he nurses fabulously and he's a great solids eater. So, other than because the doctor's say so, why exactly can't my 10 1/2 month old have cow's milk?