Beartime - at 4 months we were feeding at 7am, 11am, 2.30pm, 5pm, 6.30pm, 10.30pm. At 4.5months, he started feeding at around 4am as well.
Have to confess that I was never very good at spotting growth spurts - I did all the stuff Gina says about expressing so that when you hit a growth spurt you've got the extra milk there ready - but I never really found a point where I needed to do that!
I know lots of people say there is a growth spurt at around 4 months. But it certainly didn't feel like a growth spurt at the time.
It actually got quite a bit worse at around 5 months - he started waking twice in the night, couldn't make it to the next feed in the day, which started throwing his naps off (had never been a problem before). I actually started weaning him at that point, and he went back to one night-waking after a couple of days. Don't know whether that was a genuine growth spurt that I overreacted to, or what!
Thinking about it the night-waking thing some more, I think I lied to you about him starting to drop the night feed. I know he did that the first time he started to sleep through at 3 months - but I think at 7 months it was a bit more confused. Certainly his nights were erratic for quite a few weeks - he'd sleep through one night, then wake for the next four. Sometimes he seemed to be genuinely hungry, other times if I fed him, he wouldn't be hungry at 7am. He also cut his first tooth at around 7 months, and I remember being unsure how much of the night-waking was down to that (I was tempted to think very little, since he didn't seem at all bothered during the day! :) )
Sorry that's a bit rambly - trying to brain dump anything that might be relevant!