Hi! my daughter is premie 30 week born 1.3 kgs ,now 3 1\2 yrs ,we started her intense physio 1 1/2 mth back and she has shown good results,she could not sit ,now her back has straightened and sits with a finger support,according to neurologist she is mild dystonia but we started physio late coz she use to fall sick every 3 day so exercising was not possible ,now she started speaking,eats everthing and alert ,earing test good results,delayed milestones I understand but please tell me how long?