"Nouns have two grammatical genders: common (utrum) and neuter (neutrum), which determine their definite forms as well as the form of any adjectives used to describe them. Noun gender is largely arbitrary and must be memorized; however, around three quarters of all Swedish nouns are common gender. Living beings are often common nouns, like in en katt, en häst, en fluga, etc." (https://en.wikipedia.org/wiki/Swedish_grammar) "Mamma" has common gender, so it's "en mamma", "en svensk mamma" or "min mamma". "Barn" is neuter, therefore you say "ett barn", "ett svenskt barn" or "mitt barn".