It should be a happy time of year. It's my babies first Christmas and I'm super excited but at the same time I'm so worried and anxious about my baby not hitting milestones. He is 8.5 months old and has just started sitting but he still falls back or sideways. He sits a good 20mins or so then topples. All ther babies his age are sitting perfectly. He has been up on all fours for a good 6 weeks but doesn't yet crawl just rocks and falls. He only says baba and gaga. He has no teeth ( I know that's not a milestone) I just feel like he's doing everything late and find myself looking up all sorts of scary things.