Honestly, I would have asked to be reseated for completely different reasons. I don't hate children but I have had too many experiences with bad parenting on flights. Parents who didn't bother to bring toys, snacks or anything and who think it's just fine for their angel to kick my seat back or pull on the tray the whole flight. Yup the whole flight.

I have an auto immune disorder that causes joint degeneration and severe pain. I've already had to have one spinal surgery because of it. So for me and my immune system, I would request a reseat. Any accidental bumping that I can avoid is a good idea. I couldn't expect a toddler to be still the whole flight. At least not in my years of experience. I'm sure there are exceptions, I've just never been lucky enough to be seated with them.