M.S.
My babies ate every 1.5 to 2 hours round the clock until they were about 7 months. (We had acid reflux though, so that was a little different). But, I do remember my son, now 13 months grew a whole size about 5-6 months in a week or two, and then he did it again about a month later. Then he did it again. I think each baby is different and unique, but I wouldn't put a growth spurt past him. I bet that could be what is going on. I hope it slows down for you soon so that he can get some sleep. One thing I found that helps is to fill them up about 1.5 hours before bedtime on solid foods, and then feed them milk right before bed. It seems to last a little longer. GL!