As the body of an adult and a child are very different, it is natural that there is an ideal repellent for each. Still, the changes between one and the other are not drastic.
Repellents for children, for example, are hypoallergenic, usually with a pleasant smell and lower concentrations of active ingredients in the formulas, while the products for adults are usually odorless and with longer-lasting action, due to the higher concentration of repellent substances.