noun which may take the genitive case particle 'no'
postnatal; postpartum; after childbirth
Used as a no-adjective to describe the period, care, or conditions after giving birth.
出産後のケアはとても大切です。
Postnatal care is very important.
出産後の体調がなかなか戻らない。
My physical condition after childbirth just won't return to normal.
Compound of 出産 (shussan, 'childbirth') + 後 (go, 'after'). The reading しゅっさんご follows standard rendaku and on'yomi patterns.