Pay attention to the expiration date on the bottle. Sunscreen loses its effectiveness over time.
 

Put on sunscreen 30 minutes before going outdoors - it needs time to work on the skin.
 

Reapply sunscreen at least every two hours, or after swimming or sweating.
 

Be sure to apply enough sunscreen -- about one ounce (about the size of a shotglass) per sitting for a young adult.
 

Apply sunscreen with an SPF 15 or greater to areas of your child's skin that aren't covered by clothing. Before applying, test the sunscreen on a part of your child’s body looking for an allergic reaction. Apply carefully around the eyes, avoiding eyelids.
 

The sun's damaging UV rays can bounce back from sand, water, or concrete; so be particularly careful of these areas.
 

Limit sun exposure during the peak intensity hours - between 10 a.m. and 4 p.m.
 

For sunburns, get out of the sun right away and apply cold compresses to the affected areas.
 

For over 6 months of age, make sure your child wears clothing that covers and protects sensitive skin.
 

Per the American Academy of pediatrics, babies under 6 months of age should be kept out of direct sunlight. Move your baby to the shade under a tree, umbrella or stroller canopy. Dress babies in lightweight clothing that covers the arms and legs and use brimmed hats that shade the neck to prevent sunburn.