11 mth old girl had clicky hips at birth cant sit up yet,any reasons ? Was in a harness for her first 3 mths,am told she is fine and needs no more appointments.She puts weight on her legs fine in the bouncer and walker but does not want to stand on your lap or the floor.She can roll over on the floor but is quite chubby.Legs very agile can suck her toes.Is very placid eats and sleeps well doesnt even bother to pull herself up.Is the balance affected by her hip problem.I am her grandmother and she is coming into my care,I have always had children around but not come across this before.I don't feel she has had enough stimulation,she is very alert,she hears and watches everything but I am worried that she seems so far behind.Any suggestions or help please

Summarized question: Could anyone provide information on the clinky hips at births?