I have a 7mo that's not drinking his formula that well. He used to take 5 to 6 oz no problem, but now has trouble doing 2 oz in one sitting. He started solids at about 5 mos so I don't think that's the main culprit. Currently, I make a 6 oz bottle and will just feed it to him over the course of 45-60 mins - 2 oz at a time. Any other suggestions or ideas?