Honestly, I don’t think we’ll even get a kiss till the end of the series from them because of Rumpel being afraid of them breaking the curse, so I highly doubt that being able to “make” babies will be in the picture.
I suspect that after everything that they would start a family. There would be time for everything, and Belle would probably be someone who would want children.
I’m personally hoping for a minor “love” scene between them, nothing risque, but something sweet and enough to fill that void in Rumbelle fans. haha.