I bought a Natursutten with the round nipple. My DS really likes it. I also use the Soothie brand because he likes that one too. In fact sometimes if we are going for a long outing I will bring both because one will work better than the other. He hasn't liked any of the ones with hard mouth guards. It was recommended on my DDC board to have a round nipple to lessen the chances of biting. My DD was a biter so I heeded that advice. My neighbor has the Natursutten orthodontic and her baby is not biting. I had bought several different ones to try. I was a human pacifier with my DD and it was just too much for me. With this baby being #3 and the other 2 having activities I wanted something to soothe the baby temporarily. My DD would have nothing to do with a pacifier. This baby takes it on ocassion and prefers to fall asleep with it rather than at the breast. I introduced it at around 2 weeks because I was confident with breastfeeding. My 1st DS only took it when we were in the car.
Soothie is made of silicone and often used in hospitals. So I don't think it fits your natural or organic request. But my son does like it.
Natursutten is made of rubber with the protein removed so there is no risk of allergy. This one also has a loop on the end so you can attach a strap so you don't lose it. Here is a link so you can see what it is (Not a store endorsement, just an easy link to share):
http://www.kangarooboo.com/product/d...-for-03-Months