Here is a quick and easy guide for reducing pesticide exposure put out annually by the Environmental Working Group. The Clean 15 are fruits and veggies that you can buy conventionally with a lowered concern for buying organic. But the Dirty Dozen are the filthy ones with the highest pesticide content and this is where your organic dollar should be spent.
The negative effects of pesticides are numerous, particularly for small children. Keep it clean for you and your family!