What does 生後 mean?
生後 is a Japanese noun meaning “post-natal; since birth” in English. It is written as 生後 in kanji, せいご in hiragana, and seigo in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
生後6か月の息子に歯が生えかかっています。
My six-month old son is teething.