We have been successfully doing the Ferber method with my 4 (almost 5) month old for 2 nights. He was showing signs of self settling already (he was self settling beautifully until the day he hit 4 months when we hit a horrible regression, but has been randomly self settling here and there too since) and he's super chunky, he's filling up 6-9 months clothes.
It worked surprisingly well at night. 25 mins of crying (some of it was low level moaning rather than horrible cry) the first night, 10 minutes last night.
What do we do about naps? Do we keep rocking him to sleep etc or try Ferber? First nap of the day is easy, he goes down instantly. What about the rest? He tends to really, really fight them. Can I cosleep for one of his naps? We tend to cosleep to get a good midday nap.
Before sleep training, the last 3 weeks he has been waking up every 60-90 minutes, he needed loads of rocking AND the breast, it was horrible. Tried cosleeping at night, didn't work.