Well its important to know that Melanoma in kids is much rarer than in adults.
Children less than 10 years of age have about 1 in a million!
Adolescence has an annual incidence of 18 cases per 1 million in the 15-18 age group.
Melanoma in these age groups often comes from an existing birthmark or mole (which is different to adults where it can be a new spot). So really the answer to the question of when kids should have moles checked is IF there is a changing mole, and routine should skin checks probably are not warranted until at least above the age of 18.
If you have any concerns over your children's skin - please come and see one of our qualified dermatologists!