Mattel has launched a new Barbie. The new fashion doll has long blonde hair. She has a pretty dress. And she also has Down syndrome.

What is Down syndrome?

One in 800 babies has Down syndrome. These babies are born with an extra 21st chromosome.

Chromosomes carry the genes that make us all unique.

We inherit these genes from our parents. That’s why we often look like family members.

Written in your genes

Kids with Down syndrome look like their family members, too. But thanks to that extra chromosome, they also share certain features.