Big changes in feeding

Rebecca is now eating 5-6 oz on average, and while we were away, she even ate 7 oz on one occasion. I am considering trying out cereal once she turns 5 months. I am also going to move on to bigger bottles. I have some 6 and 9 oz bottles right now, but the vast majority are 5 oz. Sometimes, when I use a 5 oz bottle, I can tell she wants to drink more, but by the time I get her the next bottle, she has lost interest. If I present her with 7 oz, she will regularly consume 6 oz. Becca has improved her manual dexterity and control and will now try to hold the bottle herself (or hold with one hand and grasp my finger with the other hand).