don't worry la, my big head and heavy B cld only flip the body when he was 7 mths old. doc said normally shd flip body by 8mths. u give him 1 more mth time la, if still cannot flip, maybe consult another doc to c if 腦素描 is required.
My B did 腦素描 when he was 1x days old. Nurse gave him v small dosage of sleeping medicine (just like cough medicine) to intake make him sleep (not 麻醉 injection), don't worry. I don't think there is any side effect.