Hello, yes most definitely there should be concerns. By the age of 8 months a child will be walking, if not in progress. Have they had her checked from a pediatric neurologist yet? She may be having difficulty in her motor and speech skills? My son attends Scottish Rite Hospital in Dallas for his knees. Knocked knees runs on his dad's side of the family. You may want to call and make an appt. there through her pediatrician. That will speed up the process. They are awesome, I highly recommend their facility. All of the resources that she will need can, and will be met there. If not in Dallas, then a childrens specialty hospital in your area can assist you.
Good Luck,
V. - Dallas,Tx.