My only Yamaha is a cheap soprano model made in China that lacks a thumb rest (adjustable or fixed)

The Aulos model not only sounds good, but it has an adjustable position for the bottom finger and an adjustable rest for the right thumb, a big help to beginners with little hands

Advantages- increased pitch consistency, durable, adjustable thumb rest and three piece recorder can be adjusted for the pinky finger

It includes a clip-on, adjustable thumb rest, making it much easier to play