Took DS2, just 7 months, to post natal yoga this morning. There was a new lady there with her baby about the same age as DS2. The baby can already sit and crawl. I noticed this last week as the lady was new to the group. This week we all went back to someone's house for coffee afterwards and the lady came up to me and said, how old is your DS? 5 months? She knew he wasn't as at the beginning of yoga we all go around and say our names and how old our babies are. I said, no, he's 7 months and she looked quite shocked, and just said, oh, so much so that I said, "oh your little girl is crawling very early isn't she? My other son didn't crawl until 8 months?" I felt I had to say something as she was staring at DS2 as if he was developmentally delayed or something! BTW, he is bang on 50th centile for height and weight but looks bigger, is very alert and in no way delayed! I can only assume that because it's her first child she has no idea that babies do things at different times/stages, some miss out crawling all together! Am I being paranoid?? I'm a bit befuddled from sleep deprivation but I thought the average time for babies to sit was 6-7 months and crawl at around 8 months??