Hi BI9000 in California, The makers of Radiesse, Bioform, were bought out today by Merz pharmaceuticals. I doubt that either company will say that it is okay to recieve Radiesse while breastfeeding. You know how those lawyers can be if G-d forbid anything goes wrong with your little ankle biter in the next say....75 years. So our professional answer is no, wait until the little guy is off the teat. Now if my wife were breastfeeding our little one year old, and couldn't wait for her Radiesse fix, I would think to myself, "What's the worst thing that could happen?.... the kid might have a little more facial fullness, maybe be a little less jowly." Then again, we'd be thinking about weaning him around now. There have not been any studies on breast feeding moms and Radiesse for the obvious reasons cited above. Good luck and be well. Dr. P