They get skull fractures, concussions, dental injuries, and deep cuts. There have even been some deaths. Most of the serious walker injuries occur from falling down a stairway. When a crawling child falls down steps, his tumbling breaks his fall. When a child goes down a stairway in a walker, he accelerates and crash-lands at the bottom.
Some parents believe walkers help children learn to walk.
On the contrary, walkers can delay both crawling and walking if used over 2 hours a day. Don't buy a walker. But if you have one, take the wheels off. If you're not convinced of the dangers and leave the wheels on, be sure to keep the door to any stairway locked. Children in walkers have crashed right through gates.