"Barnet" means "the child". If there is -et or -en at the end of a word it means "the". However, if it's "ett barn" it means "a child" because when "en" or "ett" are at the beginning they mean "a". For example: - En kvinna: a woman - Kvinnan: the woman As you see, in the first one, the article is at the beginning so it means "a", but in the second one, it means "the" because it is at the end of the word. I hope you understand now.