Getting an exotic insect may be a great idea, and stick insects have been known to make great pets for children. However just make sure you learn as much as you can about how to care for a stick insect beforehand and ensure that you can offer it a good home.
Stick insects can live up to a year or more, and during this time they'll probably breed and produce hundreds of eggs! Will you be able to then look after more than one stick insect? Take into account all the basic needs first, then think again about whether you're still committed to owning a stick insect.