Apparently we parents make a lot of mistakes when it comes to putting sunscreen on their kids.
Some of the more common ones include not remembering to reapply sunscreen every two hours, or after swimming or sweating. Another common mistake is not using enough, or failing to take the time to really ensure that it covers every single little spot that’s exposed to the sun (think the back of the knees, the ears, and the tops of hands and feet). You want to make sure you apply enough sunscreen to completely cover the skin – most people actually only apply about 25-50% of the proper amount.
For an adult, this is about the size of a shot glass, so figure about half that for a child and a bit less for an infant or toddler.