She cursed herself to not bear a child against Cora in season 4.
Pretty sure a writer prescribed TLK will clear that right up.
Wasn’t there at one point around Season 1 it was said that a TLK could break any curse any where hence the big wave of light and love….what if Regina’s barren curse is already broken and she just doesn’t know it?
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"If you go as far as you can see...you will then see enough to go even further." - Finn Balor