When you take your children outside for any length of time, the most important thing to remember is to use a good Sunblock on their delicate skin.  Children have skin that can quickly be damaged by the rays of the sun.  What happens is that over time, this damage that was started so young can build up until when they are adults, they will have early signs of aging and a higher chance at getting skin cancer.  Skin problems can be eradicated at an early age if you just make sure you start them using sunscreen at an early age.