New to MN, I'm after advice re possible 4 month growth spurt. Have wee boy who is feeding every hour, won't nap, waking in the night after he was sleeping through since 4 weeks. I'm exhausted, feel like I don't have enough milk, how long will this go on for?? Should I swap to formula? Did anyone else have 4 month growth spurt - my daughter didn't, is it just greedy boys?! Will it last much longer?