Remember how our body has special books called DNA?

These books are grouped into bigger packages called chromosomes—like shelves in a big library.

Most people have 46 chromosomes, organized in pairs. But in Down Syndrome, a baby is born with one extra chromosome. That means there is one shelf with three books instead of two!

This extra chromosome can affect how the body and brain grow.

People with Down Syndrome may have certain features, like a flatter face or eyes that tilt upward, and they might learn more slowly or need extra medical care.