Why are the ages of one to four a dangerous time in young kids’ life?

Children aged eight and older may start playing baseball, soccer and other sports. Ask your doctor which sports are right for his or her age. Be sure your child wears the protective equipment designed for that sport, such as shin pads, mouth guards, wrist guards, eye protection and helmets. Ask your child’s coach what is needed.
    Remember that from the ages of one to four, your child can walk, run, climb, jump and explore everything. Because of all the new things he or she can do, this stage is a very dangerous time in your child’s life. It is your responsibility to protect your child from injury. Your child cannot understand danger or remember "no" while exploring.
    At age five, your child is learning to do many things which can cause serious injury, such as riding a bicycle or crossing a street. Although children learn fast, they still cannot judge what is safe. You must protect your child by constantly reinforcing safety rules.
    From age eight and up, children begin testing their wings and taking off on their own. They look to friends for approval. They try to do daring things and they may not want to obey safety rules. During this transitional age the safety lessons learned at an earlier age with your help and reminders will keep your child safe.