On October 12th we celebrate Children’s Day in Brazil. Children’s day is a day to honour children and is celebrated in many countries in different dates.
Child is singular and children is plural.
A child (or children) can refer to a person up to 12 years old or can be someone’s son or daughter.
Example: My cousin has two children – Andrea and Michael.
When I was a child I used to eat all sorts of vegetables.
The children of that school will receive a Christmas present this year.
Maybe I’ll have a child one day.
Happy Children’s Day !