I dont know the answer to your question, but if I were you I would have a couple of
cute hats on hand, babies lose a lot of heat through their heads so it really makes sense
to have a little hat on them especially when they are being photographed with no
clothes on, I know the studio would be warm but they would still lose heat quickly, so
from a practical point of view, a hat makes sense.
Cheers!
Im just worry that the parents wouldnt like to have a “used” hatfrom others babies, also I couldnt find those tpyes of hats on the web or did look around the shops and couldnt find anything..its have to be a nice soft woolen hat!