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No, she doesn't need to be able to get into that position on her own. They don't do that until much later. Around when they start to crawl. I would consider being able to sit by herself for a minute being able to sit up. Or at least starting to sit up.

@pui: No, just not needing anything behind LO such as a boppy ect . I would say when I could comfortably walk away when LO was sitting without the fear of her hurting herself would be "officially" sitting.

They won't get into a sitting position themselves until later so it's fine to put them into that sitting position and count it. But I wouldn't count them as "sitting on their own" unless they can sit until they're ready to get down (at which point they'll fall back on purpose or dive forward). So sitting unassisted for long periods of time- 5 min or more?

Mine would sit briefly but always end up falling sideways or backwards and then one day at 6 mo she just sat on her own for 20m and never looked back. She didn't figure out how to get into sitting on her own until well after was crawling- around 9 mo for getting into sitting position on her own(and she army crawled at 7mo and regular crawled at 9.5 mo). She was pulling up onto stuff when she figured out how to get into a sitting position.

I feel like these distinctions are not that important If anyone asks if your LO is sitting up just say-- sure, if I put her that way. But only for a minute or two so far. It's all just a skill that gets progressively better and better.