Okay so my son is 4 months old, I have started to wean him as he seems ready he’s slept through the night from around 23:00 to 8:30/9:30 for the last month or so but I have extreme difficulty getting him to sleep I’ve literally tried everything and he gets so overtired towards bedtime and during the day before a nap that he just screams and then will not settle at all. Is leaving him to cry it out a bad thing? X