Okay kiddo, so the "March of Dimes" is kind of like a group of people who work together to help make sure babies are born healthy and happy.
You know how sometimes when babies are born, they're really small and have to stay in the hospital for a while before they can go home? That's because they were born premature, which means they came out of their mommy's tummy too early.
The March of Dimes does lots of things to help prevent babies from being born too early. They do research to find out why it happens and how to stop it. They also help pregnant mommies stay healthy so they can have healthy babies.
The March of Dimes also helps babies who are already born too early or with health problems. They help provide medicine and other things that the babies need to get better.
So basically the March of Dimes is a group of people who work together to make sure babies can be born healthy and strong, and if they're not, they help them get better.