"An infant's immune, nervous, and detoxification system is less developed than an adult's and more vulnerable to the effects of pesticides," says Elson M. Haas, M.D., author of The Staying Healthy Shopper's Guide. The green beans, peaches, and apples that go into baby food (and all over your kitchen floor) tend to be treated with chemicals. Organic brands like Earth's Best are available.
No organic? Make your own purees by tossing organic fruits and vegetables into the blender.