Kyūjitai form of 小児科: pediatrics

Kyūjitai form of 小児: young child, infant

smallness; small size, small (sometimes used as an abbreviation for small serving, etc.) / Short for 小の月 (shō no tsuki).

even if one says

department, section / (taxonomy) family

Kyūjitai form of 私生児 (“illegitimate child”)

doctor

one's sister regardless of age difference / one's lover or sweetheart who is the subject of marriage or is already married / (archaic, said from a female speaker) a close female companion

Kyūjitai form of 児 (“child; young of animals”) / Used in personal names.

one's own younger sister / the wife of one's younger brother; one's sister-in-law / a younger female / (archaic, said from a male speaker) one's sister regardless of age difference