As you know, children has lower immunity than adults has. So children are more easily to get sick. In terms of pink eye, you should know that it is actually conjunctivitis, which is an irritation of the eyeballs. Allergy is a common reason that causes pink eye in children. There are several factors that you need to take into your consideration, such as exposures to chemicals, viral pinkeye,a bacterial infection, nose droplets and so on.You should watch your kid carefully. Following are some measures you can take. Prevent your kids to touching his eyes with his hands, which will get his eyes infected very easily. Secondly, let your kid wash hands as often as he can, and it will be better if he uses a soap to wash hands. Thirdly, you can prepare a clean towel for your kid for daily. Remember, never let your kid share his towel with others. And don't share his eye drops with others, either. This is a quite wrong behavior.