Julie,
That's likely uric acid crystals from concentrated urine, and is a 
completely normal finding in the first few days of life. Sad that the 
pediatrician does not know this. Check out the archives, perhaps someone 
has posted references you can share with him. You could also search 
pubmed/medline and scholar.google.com for references.
Catherine Watson Genna, IBCLC  NYC

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