The word for children in Spanish is niños.
In Spanish, niños is the plural form of niño, which means a boy or a child. It can be used generically to refer to children of both genders, although there is a feminine form, niñas, that specifically refers to girls. Thus, when speaking about a group of children that includes both boys and girls, niños is commonly used.
This term is widely used in various Spanish-speaking countries and is an integral part of everyday conversation related to family, education, and all things involving children. If you’re learning Spanish, it’s one of the first vocabulary words you might come across!