Oh what a nuisance! I'm sure you felt extra pressured by your little baby. I have no idea what policies are like at Nordstrom's as we don't have that department store in Canada, but the SAs should remember you (and baby) if you go back tomorrow. If they, or one of them does remember you, just tell them you wanted the edt instead. See what happens. Otherwise, maybe swap for someone who has the edt? Sell on ebay?
Good luck and let us know what happens.