1、kid 小孩 一般多用于口语，表示孩子很小，可以表示文体生动活泼。
2、child 小孩，孩子，多用于书面语中。
3、children 和 child 一样，children是child的复数形式。
拓展资料
kid
1. He told us to get stuffed so we leaned on his kid.
他叫我们滚蛋，于是我们威胁他的孩子。
2. He beat up on my brother's kid one time.
他有一次殴打了我哥的孩子。
3. He's like some dreamy kid playing on his own.
他就像是个自娱自乐的爱幻想的孩子。
4. "Gimme a break, kid! You know how much those things cost?"
“饶了我吧，小祖宗！你知道这些东西有多贵吗？”
5. His son was a junkie, the kid OD'd a year ago.
他儿子是个吸毒者，这孩子一年前吸食了过量毒品。
6. You're a bright enough kid, I'll give you that.
我得承认，你是个挺聪明的孩子。
7. In presidential campaigns, foreign policy is treated with kid gloves.
在总统竞选活动中，外交政策问题会被小心对待。
8. The soldiers bantered with him as though he was a kid brother.
士兵们把他当作弟弟一样和他开着玩笑。
child
1. His house was the only settled home I had as a child.
他的房子是我儿时唯一固定的家。
2. The child kept her eyes fixed on the wall behind him.
这个小女孩眼睛一直紧盯着他身后的那堵墙。
3. Don't leave a child alone in a room with an open fire.
房间里有裸露的明火时，不要让孩子独处其中。
4. If we had a child, we'd be in really dire straits.
假如我们有了小孩，我们会真正陷入困境。
5. If your child's temperature rises, sponge her down gently with tepid water.
如果你孩子的体温上升，就用海绵蘸上温水轻轻地擦拭她的身体。
children
1. They rose to the challenge of entertaining 80 school-children for an afternoon.
他们一个下午成功接待了80名学童。
2. She denied the murder of four children who were in her care.
她否认杀害了她所照管的4个孩子。
3. When your children misbehave tell them without making them feel small.
孩子表现不佳时要让他们知道，但不能让他们自惭形秽。
4. He introduced radio to the school to increase the children's awareness.
他在学校开通广播，以提高孩子们的警觉性。
5. Children at school receive coloured stars for work well done.
学校里的孩子表现得好会得到彩色星星。
6. Like their children, parents are often defensive about their private lives.
就像子女一样，父母也常常很注重保护他们的私生活。
7. She spends her Easter holidays taking groups of children to France.
她带领一群孩子去法国过复活节。