Welcome to the world, Stella! Your mother has put out a request for lullabies but after having racked my brain for two weeks, I couldn't come up with anything, and though I do plan to ask my own mum, she is on an RV trip right now. However, a little searching yielded this, something that I know both of your parents will dig:
Languages from the Cradle is a European Union funded project to collect the lullabies of Europe. Learn more in this mp3 from United Nations Radio (did you know there was such a thing? neither did I) including a lovely Sudanese lullaby, and don't miss the Languages from the Cradle wiki.
I also offer two lullabies from my favorite British songstress, Kate Rusby. The first is a real lullaby and the second and third are two versions (second one is live and I love how the audience embraces it ...I even see some young heads nodding off) of a traditional song that works well as one: