Informal:
* 小男孩 (xiǎo nánhái): This is the most common and straightforward way to say "little boy." It literally translates to "small boy."
* 小朋友 (xiǎo péngyou): This means "little friend" and can be used to refer to a child in general, regardless of gender. It's a friendly and polite term.
Formal:
* 小公子 (xiǎo gōngzi): This means "young master" and is a more formal way to refer to a little boy, often used in traditional settings.
Other options:
* 孩子 (háizi): This simply means "child" and can be used to refer to a little boy, especially if you don't know their gender.
* 男孩 (nánhái): This means "boy" and can be used to refer to a little boy if you want to emphasize their gender.
It's important to choose the appropriate term based on the situation. For example, you would use "小男孩" when talking to your friend about their son, but you might use "小朋友" when talking to a group of children at a playground.