downy hair; peach fuzz; vellus hair
Fine, soft hair on the body, especially of a baby or on areas not normally covered by terminal hair. In everyday language, often called 'peach fuzz'.
The baby's cheeks are covered with downy hair.
lanugo
Medical/biological term for the fine hair covering a fetus or newborn. In non-specialist contexts, sense 1 is used.
Lanugo serves to protect the fetus's body.
Fine golden hairs were faintly visible on her arms.
Standard kanji spelling.
Mixed kana-kanji spelling; common in everyday writing.
Rare kanji variant; may be confused with other readings.
Compound of 産 (うぶ, 'birth, newborn') + 毛 (け, 'hair'), with rendaku voicing. Refers to the fine hair present at birth.