Not sure with that but the position looks like he is exhibiting the ATNR.
Atonic neck reflex is primitive reflex in newborn, disappears after 3months..
Also can I see there’s a problem with the baby’s feet? If so can the diagnosis be put up for us to see please? Looks like he has thin feet with toes missing too..
Actually all his toes were intact... Difficult to see from the picture