小朋友
The noun 小朋友 (xiǎopéngyou) is a friendly and common way to refer to children or young kids. It literally means "little friend" and is widely used by adults when addressing or talking about children. It carries a warm, affectionate tone.
小朋友们在公园里玩得很开心。
Xiǎopéngyoumen zài gōngyuán lǐ wán de hěn kāixīn.
The children are having a great time playing in the park.
这位小朋友今年几岁了?
Zhè wèi xiǎopéngyou jīnnián jǐ suì le?
How old is this little friend this year?
老师带着小朋友们去参观博物馆。
Lǎoshī dàizhe xiǎopéngyoumen qù cānguān bówùguǎn.
The teacher took the children to visit the museum.