“个头”常常用来说一个人的身高，也可以说东西的大小。

"个头" is often used to talk about a person's height, and can also refer to the size of things.

我们常说“他个头很高”或者“这个西瓜个头不小”。

We often say "他个头很高" (He is very tall) or "这个西瓜个头不小" (This watermelon is quite big).