Well, IMO first priority are the things that baby might put in his or her mouth. Then it is anything that goes on their skin, then anything that when "conventionally-produced" involves volatile organic compounds (VOCs) and so on.
For most items, my wife and I were able to find good sustainable and safe solutions, but the one thing that eluded us were board books. Kids chew everything, especially paper products like books. Nearly all the ones we could find were made overseas (mostly China) with plastic UV laminates, metalic foils and other questionable materials, and were sometimes pretty bad in the design department. Seeing that we are both "green" and both designers, we decided to make one ourselves. We used 100% post-consumer recycled paper and Non-petroleum inks, glues and water based coating, and tested the books for the eight heavy metals covered under CPSIA. You can check it out at squishypress.com and so ends my shameless pitch ;-)
But if I were to choose a #1, I'd have to go with milk. Not only does organic practices eliminate pesticide contamination, it avoids the antibiotics and hormones they load the milk cows with so they can survive the CAFO system.
