I get weekly emails from babycentre and was reading the one tonight as DD2 is now 8 months. It said that now my baby is 8months she's likely to be crawling and calling me and my partner mama and dada! DD2 is no where near doing that and as my 3rd baby I think she is completely normal as my other two didn't do these things at 8 months (and DS was walking at 9months) and I don't think any of the other babies in all the baby groups I've been to have. If she had been my first I think I would have been really worried that she was developmentally behind.
It really makes it out to be the norm rather than as I would think the exception, or am I wrong am most babies doing this at 8months?