Look for products bearing the logo of the Canadian Dermatology Association. For best results, sunscreen should be applied 15 to 30 minutes before exposure to the sun so it is absorbed by the skin and less likely to rub or wash off. Apply the lotion liberally, according to instructions, and renew it every couple of hours. For children wearing bathing suits, make sure that sunscreen is applied up to and under the edges of the suit to protect sensitive areas like the upper thighs and chest. Pay particular attention to the tops of feet and the backs of the knees.
Babies are specially vulnerable to UV radiation and also to overheating.
Sunscreens, like many other products have a limited shelf life and become less effective over time. Consumers should check the expiry date of their old sunscreen containers and replace them if they are out of date. The same UV rays that harm the skin can also cause injury to the eyes, with infants and children being particularly susceptible to this kind of damage. Standards for sun glasses have improved dramatically in the last few years, and virtually all brands are effective at screening or reflecting ultraviolet light. When buying sun glasses, see how well they cover the eyes.