This was tough. I thought over how I was going to address this, and perhaps this is the most mature way to do it, maybe a little too mature.
Some headcanon is involved here, but until we see something in upcoming seasons of MLPFIM, I dont think I want to expand the idea of them having a kid just yet. Our Shining Armor wants to be a dad, but I guess Cadance isnt ready for such a big step. This, coming from Princess Heartbutt.
Thanks for holding out for an answer. I hope I havent disappointed any of you.
Keep the questions coming!