We're having such a hard time with the four month sleep regression. I don't think it'll end until my boy can self soothe. He's five months old in a few days. When he starts to look sleepy I put him in his bed but he'll either start playing or crying. I can only get him to sleep by feeding him or, during the day, the cooker extractor fan works! How can I teach him this skill? Is he a bit young to learn still?