子 child

一 (one/line radical) + 了 (total)

★★★★★

3 strokes

From now on, when you see a kanji with the onyomi of "KO", please use 子供 (KOdomo) for the English keyword.

Onyomi

SHI	That poor child ーSHE has lived a total of one year!

こ	child ★★★★★

子供(こども)	child ★★★★★ KUNKUN 子 (child) + 供 (accompany) = 子供 (child)
親子(おやこ)	meat and eggs ★★★★☆ SARC KUNKUN 親 (parents/kindness) + 子 (child) = 親子 (meat and eggs) parents and child together - also the rather cruel name for a traditional dish: boiled chicken served with scrambled eggs.
調子(ちょうし)	condition ★★★★☆ 調 (check out) + 子 (child) = 調子 (condition) the condition something's in. Can be used with a living thing or object. Always used only with いい or 悪い. Usually emphaizes the LONG TERM condition. Although hungover people have been heard to remark, 調子が悪い！
椅子(いす)	chair ★★★☆☆ FP 1/2 KANA
車椅子(くるまいす)	wheelchair ★★☆☆☆ KUNKUN NEO 車 (car) + 子 (chair) = 車椅子 (wheelchair)

A child is ONE year old.

The complete kanji is complete even WITHOUT the 'one' radical.

MAMA was around before baby.