If other milestones are being attained on time, this aint a worry.

<font color ="#3b5998"><b><a href="http://app.babychakra.com/article/1822">7 Months Baby: Physical Milestones</a></b></font>

All babies are different in achieving milestones and usually seven months is a time when some babies are trying to sit and balance and trying to crawl..so don't get worried..good diet.. massaging legs and bum area and encouragement will Help