P.M.
We did the ferber at 4.5 months, and it worked. You have to do something very soon, or this will become the norm, and as they get older it will be more difficult to do any sleep training. Read Ferber again, and stick to it if you go with it. There will be relapse, but you just implement it again, no slacking!!! Babies will push the limits, and it's up to you to stay consistent. I think if your child is nursing at night, and truly nursing, then he is hungry and he is not getting enough during the day mainly because he's getting it at night. You have to gradually wean him from night time nursing, and add the amount to the daytime. Though we did the ferber at 4.5 months, my son was taking a bottle at nights till 7 or 8 months and that did not mess up the sleep because he knew once he had his bottle he had to go back to sleep. It was hard for the first three days, but that's all it took and he's almost 4 now and we are very happy we did it. My niece is 4 months older than my son, and they did not do any sleep training and she still have problems. They tried to do ferber at one, but it was too late for her. If you don't set healthy sleep habits soon, the sleep problems will follow for years to come. Be consistent what ever you pick and though you can be a bit flexible later, now is not the time. He'll get it soon enough. good luck