As adjectives the difference between newborn and postnatal
is that newborn is recently born while postnatal is (of a baby) after being born, of or pertaining to the period immediately after birth.
As a noun newborn
is a recently born baby.
newborn
English
Noun
A recently born baby.
Synonyms
* neonate
postnatal
English
Adjective
(-)
(of a baby) after being born, of or pertaining to the period immediately after birth
(proscribed) (of a mother) after giving birth
Usage notes
In careful usage postnatal' refers to the baby, after ''being'' born, while the mother, after ''giving birth,'' is referred to as postpartum. In casual usage ' postnatal may be used for both.
Synonyms
* (give birth) postpartum
Antonyms
* prenatal
* (be born) postpartum
References