Kids Ocarinas

These ocarinas are labeled as "kids" because they are not a professional quality and may not have the same strict tuning or consistency as the professional grade or adult ocarinas.

This doesn't mean that they sound bad, but consider the usage of more of a toy that is played with daily (professional) vs a toy that is played with a few times every once in a while.   

The kids ocarinas are also classified because of their cost.  Kids are more likely to break a ceramic object, so it is not wise to give a child an expensive professional grade instrument until they learn how to care for one that will not cost as much to replace.