There are many different mosquito repellents on the market claiming to get rid of the pesky insects. In this WPBF25 news report, Gary Good whose job is to get rid of mosquitos says that the best product to do the job is one containing deet.
However, Dr. Mejia who was interviewed in the video, says that large quanities of deet can cause neurological problems if taken in high doses. WPBF25 News found that one product contained 98.25% deet, where Dr. Mejia states that you generally only need 10-30%. It has a higher risk of systemic absorption and can potentially cause concern if used too much on your kids. So be careful in what product you use to prevent insect bites.
Note: You can see Dr. Mejia speaking in the video at at 1 minutes, 55 seconds.