Hi, I haven't been on this forum in a while, but now that I'm back at work I have some free time again to read up on some posts.
My twins were actually born in Sep. and are now 4 months and 1 week. The max that they can eat is 4.5 oz (140ccs) but it doesn't happen every time. One of the babies usually will finish his bottle more often than the other baby. they are gaining weight and are growing in lengh, so I'm not worried even if they only eat 2.5-or 3ozs during one of the feedings. We actually started cereal last weekend we only give it to them twice a day for now 1 tsp in each feeding. They are not crazy about eating from a spoon, but have no problem eating cereal from a bottle.
Aiden will eat 4 oz every 3-4 hours sometimes 5 oz..he is growing though he is a healthy 25 1/2 inch boy and 13lbs 2 ounces so i wouldn't worry that much about it
When my son was Sarah's age he was eating like a little piggie, at his 4 month check up he weighed 17lbs All of my neices and nephews have been piggies too. Sarah i guess is the "normal" one LOL.
I'm breastfeeding so it's hard to know exactly how much Ewan is eating. When I give him a bottle he takes between 4 and 6 oz, usually every 3-4 hours. He is quite a chubby wee guy though, he was 15 lb 4 at 10 weeks! I think there's nothing to worry about as long as they are growing and gaining weight ok.
I am bf-ing too but Molllie drinks 4-6oz when she gets a bottle. She is in 6-9mon clothes too!! I think she probably weighs around 14lbs now.