Hi everyone. Loooong time lurker here! 
So we're driving into Buffalo and flying out from there. Is it problematic if we try and pass through the border with just a birth certificate if the child turns 16 during our trip? My daughter will still be 15, but my niece (who we've taken before no problem) will be 16 by our return date.
Thanks!

So we're driving into Buffalo and flying out from there. Is it problematic if we try and pass through the border with just a birth certificate if the child turns 16 during our trip? My daughter will still be 15, but my niece (who we've taken before no problem) will be 16 by our return date.
Thanks!
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