Making sure you’re using the correct sun cream for yourself and your children is important, as burns can cause long-lasting damage. If you’re an adult, you should use at least SPF 30, and younger children and babies should use SPF 50. The SPF is the sun protection factor, so this indicates how much the sun cream protects you from UV rays. Your sun cream should also be UVA 4-star rated. You should also double-check that your sun cream hasn’t expired, as that would prevent it from effectively protecting you from the sun. https://www.nivea.co.uk/advice/sun/how-to-apply-sunscreen#
Sun cream should be applied when first going out in the sun, every few hours if you’re dry, or every time you leave the water if you’re at the pool or the beach. You should also cover up with clothing and take regular breaks in the shade. It’s also important to remember that the sun does not determine whether you burn; the UV rating does. You should always check the UV rating before going outside, as you can still get burnt in cloudy weather. For more information on how to properly use sun cream, see the link below.
https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-sun-safety/