From a chemistry point of view, DHA and erythulose (the active tanning ingredients in most spray tans) are simple sugar molecules and are completely safe and non-toxic. As would be the Maillard reaction products that will be created when the DHA and erythulose react with amino acid groups in the top layer of the skin (Maillard reaction products are common in many foods, e.g. bread, and are formed when sugars react with proteins when heated or exposed to oxygen).
Depending on the other ingredients in the spray tan liquid, it may be advisable to not breast feed until the colour guide is washed off.
Or, if extra paranoid, treat the areolae with barrier cream, so no spray tan solution is absorbed there.
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