Hi Laura, Had a similar yet different situation just a couple of months ago. I don't believe any steroids were used. Baby was put on formula for 1-2 weeks. Only specifics were for mom to choose the lowest calcium formula she could find, she wasn't given a brand or type. The formula did not lower baby's levels and he was allowed to resume bf. In this case, mom had very high calcium levels herself prior to, during and after pregnancy. After bf was resumed she pumped during interim) she got mastitis, she returned to work, her levels continued to be high so it was recommended she wean. Apparently, in rare cases, some mothers have higher calcium levels when bf. Her levels did go down but are still elevated. Last I heard, no cause has been found. Parathyroid tumor was ruled out and she was having DNA sequencing done. I do not have access to all my notes right now. I can get you more info on Monday. I was in touch with a couple of people on this list. I served mostly as a support person for mom. It was a frustrating situation in which I wished I could do more. I provided names of labs which would measure calcium levels of breast milk but the MD's were not willing to test. As mother was exclusively pumping during the formula trial, it would have been simple to get a good sample. I plan to write things up for future reference, am waiting on copies of the labs from the mother. Now that she is no longer bf, she is not as motivated to have it documented as she was when it was all happening. Of course, she is working FT w/a long commute, has 2 children and feels poorly the majority of the time. From what I learned, the calcium levels of breast milk vary very little. HTH. I can provide what information I do have, which is limited. All the best, Allison Laverty Montag RLC, IBCLC Wisconsin, USA Laura wrote: Does anyone have experience with an exclusively breastfed infant with mild-moderate hypercalcemia (serum calcium levels between 10-11.7 for 4+ weeks now)? Was there any intervention for the hypercalcemia? If so, what? At this point one endocrinologist has recommended treating with steroids and a second has recommended low calcium formula. Neither of those recommendations is particularly appealing. There is no official diagnosis for the baby yet. Williams syndrome is unlikely but hasn't been totally ruled out. Hyperparathyroidism has been ruled out, PTH was very low. Any IBCLC endocrinologists or experts on calcium homeostasis out there:-) Thanks in advance, Laura Wasielewski MS, CCC-SLP, IBCLC Los Angeles, CA -- "Our doubts are traitors and make us lose the good we often might win, by fearing to attempt." William Shakespeare Measure for Measure *********************************************** Archives: http://community.lsoft.com/archives/LACTNET.html To reach list owners: [log in to unmask] Mail all list management commands to: [log in to unmask] COMMANDS: 1. To temporarily stop your subscription write in the body of an email: set lactnet nomail 2. To start it again: set lactnet mail 3. To unsubscribe: unsubscribe lactnet 4. To get a comprehensive list of rules and directions: get lactnet welcome