Child
Kid
noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it uses the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
You saw a child and gave her your coat (こ). The kid looked all cold, so you gave her your coat. Children never want to wear proper warm clothing when they should, then they end up shivering their butts off and needing to wear a parent's oversized coat. Fortunately you were there to give this 子 your coat.
そのライオンの子はシンバという。
That lion's child is called Simba.
あなたは、わたしのほんとうの子ではないの。
You aren’t my real child.
わたしの子、ビヨンセににているとおもわない？
Don’t you think my kid looks similar to Beyoncé?