my granddaughter is now 16 months old and she is one of the twins. she cant stand up till now but she crawls on her butts very fast..the doctor excamined her and said there is a piece in her two hips that is grown enough and he recommended a supporter to wear around her waist and legs....please I want to be sure that she will grow up mentally and socially as her normal peers. Though her doctor recommended a surgery if she did not improve in three months from now. Thanks alot.