Missing babies/toddlers/children

Hi all. I've been having issues with my Sim's offspring - they kept on disappearing after I exit the game. It already happened thrice. The first time it happened, I was moving my family to another house. I tried exiting and opening again. But the baby is really gone. He's not in the family tree, not in Sim panel at the left bottom, and I also tried checking my Inventory, but no cradle there, no baby. 



This happened again with a new toddler. I tried the ResetSim cheat, but it's not there. It just shows "Sim not found".

After that I did not exit the game anymore, maxed out my new kid's aspiration, and then my game crashed. When I got back again, no more child.

Help.

Go to Documents\Electronic Arts and move The Sims 4 folder to desktop. This will start the game fresh, you can move saves back later. If that doesn't solve the problem, run the validator and post the result here.