Simply put: Consumer Reports tested 50 popular baby food brands and found worrisome amounts of arsenic and lead in some of them (including organic).
Scroll through the post for the breakdown.
The 15 baby foods that would pose a risk to a child who ate one or less servings per day
Beech-Nut Classics Sweet Potatoes
Earth's Best Organic Chicken & Brown Rice Earth's Best Organic Sunny Days Snack Bars, Strawberry Earth's Best Organic Sweet Potatoes, 1st Stage Earth's Best Organic Whole Grain Rice Cereal Earth's Best Turkey, Red Beans and Brown Rice