Ok, DD is 17 months old and has hypermobility in her hips which means she is not yet mobile (crawling or walking). We have a physiotherapy appointment to address this next month. I have concerns about other aspects of her development though, including no words being spoken yet (she does babble) and no imaginative play. I am not sure she understands instructions either (does not point to things in books or pass toys to me if requested), and when I watch het in a group of toddlers she seems to have more in common with the 12 Month olds than the 18 month olds.
She has always been the last to do things of babies I know her age (take to solids, point, even getting head and neck control) so I think fine, she is a bit slower...
When do you actually worry though? When do you stop thinking "she wil catch up" and start asking for a professional opinion?