嬰
エイ, ふ.れる, みどりご, あかご

sharp (music), baby

JLPT0 G13 S0 F5000

賏# is an abbreviated form of 賡 (continue without interruption) + 貝 shell → string of shells, made into a necklace. 嬰 adds 女 woman → shell necklace extending about a woman's neck → *extend about*. *Baby* and (musical) *sharp* are borrowed meanings.

[Full Kanji Etymology List]