My bff son is almost 4 months old. He does start each feed with the breast but she is only producing 4oz ( 2oz each breast) total. She tops up with formula after each feed. Now she asked me how much my daughter eat at 4 months and I told her 30-35oz in 24 hrs. She then tells me her son has the breast (4oz) plus a bottle (6oz) at each feed so 10oz

. He does six feeds during the day and one at 5 am so 7, 10 oz feeding in 24 hrs. I didn't want to say anything as I have no idea if thats too much but 70oz in 24 hrs just seems like a heck of a alot. He doesn't throw up after eating, doesn't have tummy ache after eating she told me, he is a happy baby but is she over feeding him? He has a check up tomorrow and he's getting weighed as well, her home scale says he's 20 pounds already

. He was 6pounds and 5 ozs at birth so he wasn't a big baby by any means. Is he just a big eater or is she way way over feeding? Should I say anything?