So I'm back at work and pumping. I leave various bottles of milk for my inlaws (who are watching the baby-4 months old). Lately they are giving him two bottles back to back- meaning he takes 6 ounces total for a feed. I typically pump 4 ounces each time at work. I feel like the 6 ounces is too much at once- I know he probably chugs it down though. Should I ask them to keep the feeds around 4/5 ounces to match what he eats when he is bf? Does that matter?

How much/how often is average at this age?