sharp (music), baby
嬰 centers on a baby or infant, with a secondary specialized meaning of a sharp note in music. The two senses are unrelated in modern Japanese; the baby meaning is the primary everyday sense, while the musical sharp is a technical term.
嬰 combines 賏 (a doubled shell/eye component) with 女 (woman). The exact historical development is uncertain, but it likely originally depicted a woman with a baby or necklace, later extended to the musical sharp sense through phonetic borrowing.
The top 賏 looks like two eyes watching over a baby, and the bottom 女 is a woman. Picture a woman carefully holding a baby in her arms.
For エイ, imagine a baby saying 'A' (エイ) as its first sound, like the letter A. The baby's cry sounds like エイ.
sharp
infant; baby
infant; baby
G sharp minor
D sharp minor
C sharp minor
F sharp minor
F sharp major
infanticide
sharp (sign)
sharp (musical note)
conservativeness; conservatism; regression; retrogression; unadventurousness
backward-looking philosophy (ideology); conservatism
conservative (regressive) policy
conservative; regressive; backward-looking; unenterprising
double sharp (symbol)