my bsby keeps one hand twisted to backwards during tummy time and when i take him on shoulder for burp... sometimes he keeps normal and sometimes he does like that. his activity is good, his grip is also good in that hand. i went to ped fir this. he sugggested for neuro opinion. and neuro dctr askd for mri scan. i got it done. report came normsl but aftr seeing the films, neuro doctor said there is a little space in sulci region.he said its not a problem and dont worry but i am still bothered about it. is this normal?