子 is a picture of a baby: a big head on top, a body, and arms — the legs are wrapped in a swaddling cloth, which is why there's just one stroke at the bottom. It's the same baby you already met inside 好 (woman 女 + child 子 = good).
子 is incredibly common as a noun-ending suffix that turns words into everyday objects: 桌子 (table), 椅子 (chair), 杯子 (cup), 孩子 (child). In this use it's toneless (zi). 子 was also the highest title of respect for a master — 孔子 is Confucius ('Master Kong'), 老子 is Laozi.
A big-headed baby with arms out, legs swaddled together — a CHILD.
As a suffix, 子 makes nouns concrete and is pronounced with no tone (zi): 桌子, 椅子, 杯子, 孩子. It's one of the most common syllables in spoken Chinese.