I need an excuse to get out of work early for an interview...?

I just had a baby so I can't really use the dr. appt. excuse (although i will if I have too). I would be missing the last 1/2 of the word day and I really cant tell them the truth. any GOOD excuses? (I am giving them a weeks notice at work that I will be gone for the 1/2 day, but we have to have a reason).
Update: I cant use the baby dr. appt because I really do have an appt soon that I have already requested off for.
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