Helen,
I have no definitive answers re Decadron and Nitrous Oxide. But the decadron,
if I am not mistaken, is like prednisone (corticosteroid) and is compatible
with bf.  Mom will probalby get a low dose for swelling or something like
that.  The nitrous, I would think would be like other anesthetics, when she
is alert, etc. it would seem OK.  Esp. if we are talking an older baby or
toddler.
Laurie Wheeler, Rnc, Mn, Ibclc
Violet LA