I'm wondering if anyone has input on how much my 1 month old (5.5 weeks) son should be drinking from a bottle. I am EBF but have started pumping a few bottles so hubby can feed him and so that I can go out and run errands from time to time. I have noticed that he always empties the bottle and seems to want more. He drank a 6oz bottle one day after he had already nursed for an hour. He spit up a lot for the rest of the day (but he is a happy spitter even on a regular day). The same thing happened today - I had a job interview and was gone for 2 hours. I left a 4oz bottle and a 3 oz bottle thinking that it would be plenty. He drank them both and I nursed him when I returned (he was finishing the second bottle when I got back). Mind you, I had nursed him right before leaving as well. Once again he spit up a lot today after having those bottles. It may just be that he has a big appetite but I am wondering if he is being overfed when bottle feeding.