At what point should I start to be concerned?
She is crawling (more like army crawling/shuffling) and rolling around quite happily but she can't sit at all unsupported. She isn't showing any signs of being ready for sitting up at all. Is there anything I can do to encourage her? I know you shouldn't compare but my older Dd was sitting by 5/6 months and most other babies I know we're sitting by that age too. She's 7 months today.