Lullaby

A lullaby is a song performed for children, usually infants.

In 2370, Kira Nerys sang a Bajoran lullaby to, a Bajoran baby girl. 

In 2376, Leeta sang a Bajoran lullaby to her daughter Bena. Ro Laren hadn't heard that particular lullaby since she herself was a child. 

Klingons also sang lullabies, but they were usually warrior songs.