My mother-in-law babysat my 5 week old for about 2 hours this afternoon while I took my older daughter to the dentist. She had nursed about 1.5 hrs before I left. I left 2 2.5oz bottles for her, not really expecting her to need both of them. When I got back my MIL said that she had eaten BOTH of them! Is that normal? It just seems like so much for such a little baby!