<s>[INST] My two years son have weak legs can t walk or seat yet, He has normal at his delivery. I have give him nutrional food but problem not solved, Dr. advised to MRI Brain Scan but I have not enough money for that. Please give the answer . M. Sakhare Mo.0000 [/INST] In order to answer your question few things needed first was your child able to hold his head at the age of 3 months ? Does your child choke a lot? Does he have a recurrent respiratory infection ? Does he talk, smile, laugh, able to play ? Did he are able to sit and walk and lose these abilities? If the problem is only motor ; he can't sit or move properly, then maybe the physical exam shows hypotonia (no tone or decreased tone) which sometimes come as an isolated disorder, or maybe accompanied by other findings which need to be investigated thoroughly, because many disorders can cause that. But physiotherapy can be helpful, schedule with an expert physiotherapist and learn how to do it and do it on regular basis 3-6 times a day.  Start with the back muscles, because if your child couldn't sit, he will not walk, he needs a good back muscles. </s>