There are a few things you should avoid when using a child carrier. First, avoid carrying your child for more than two hours at a time. Second, avoid carrying your child on your back for more than four miles at a time. And finally, avoid carrying your child in a front-facing carrier until they are at least six months old. With so many different types of carriers on the market, it can be difficult to know which one to choose. However, if you keep these factors in mind, you should be able to find the perfect carrier for you and your family.