Newly-born (8)
I believe the answer is:
neonatal
'newly-born' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for neonatal that I've seen before include "Recently delivered" , "Relating to the first month of life" , "of newborn babies!" , "Describing newly-born" , "Relating to newborns" .)