I did find these links. Andy Cutler says no chelating while breastfeeding.

Don't chelate while pregnant or breastfeeding - http://onibasu.com/archives/am/131601.html, http://onibasu.com/archives/am/80791.html

If a breastfeeding mother wants to chelate, wait at least 3 months after breastfeeding ends before getting a hair test and chelating - http://onibasu.com/archives/am/54964.html

Lactation makes hair test results different - http://onibasu.com/archives/am/94728.html

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