Jazmine, Sam and Gwilym are learning more with every new day.
Their mothers are good friends too - brought together by the shared experience of having a child with Down's Syndrome.
They're raising money to pay for private therapy to develop the children's speech.
- Watch our interview with them below
Physiotherapy has helped the children hit milestones like learning to walk.
But there are still challenges to overcome. Low muscle tone means talking is harder.
The Welsh Government says there are speech therapy services available on the NHS, but it's up to health boards to provide them.
After hitting their crowdfunding target, the mothers hope to set up a charity to help other parents.