Apple Watch band size
I bought an Apple Watch yesterday and feel my braided sport band is too big. Can I exchange it for a smaller one?
Apple Watch
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If you bought it from Apple, you essentially have 14 days to return it for any reason.
Returns & Refunds - Shopping Help - Apple
If you just want to exchange the watch band, you will have to contact Apple Support. Make an appointment at the Genius Bar in an Apple Store near you (if possible) or contact Apple Support. Either way:
Genius Bar Reservation and Apple Support Options - Apple