The shoulder opening is 23 inches and it measures 9 inches from the top to the bottom. It should fit a toddler around 2 years old. Because toddlers vary in size it is possible that it would fit anywhere from 18 months to 3 years, since it does not have to fit specifically like a jacket. It is machine washable and dryable.
If you would like this poncho in a bigger or smaller size or in a specific color, please convo me and I'll be happy to do a custom listing for you.