Talk to Pediatrician on Myopathy. Development Delay

My baby boy is 16 months old. He was a premature baby born in 34th week. After birth he faced severe jaundice about 18.2 he was under rays for 48 hours. He also faced many severe infections because of weak immune system. He held his neck when he was 11 months old. Now as he is 16 months old, he is not able to sit. He has very floppy body. He has good eye contact. He reponses well. He holds things properly. He just babbles bababa. His EMG report, CPK, LDH test are attached below. Doctor prescribed him multivitamins, iron and xiqrant syrup. I am doing his physiotherapy regularly two times a day. Is he gettig the ideal treatment? Is there any need for more tests and treatment? Should i visit more doctors or just wait? Please guide me because as the days are passing i am getting more and more tensed.