Buying a kids snorkel set is not exactly the same as buying an adult set. Children are much more difficult to size. You want a pair of fins and a mask that will be comfortable on them but not items that they're going to outgrow too soon. It becomes a little tricky.
Also, kids faces are not fully developed and, in many cases, neither are their teeth so getting a mask and a snorkel that both fit well is sometimes difficult. Don't even get me started on their feet. I once saw my daughter's foot grow two sizes in a month!
If you have any questions about how to buy kids snorkel gear, then please check out our guide that will walk you through choosing and sizing snorkel gear for your child.