Why do my babies on sims 4 keep disappearing right after birth?

For a couple months now my babies on the sims 4 keep disappearing right after birth. My sim will be pregnant and go through all the emotions and stuff then she will go in to labor like normal then at the end she resets and the emotions go away. The bassinet appears but there is no baby and no thumbnail or relationship for the baby, nothing pops up to name it or pick traits either. At first i thought it wasn't a big deal and just let her become pregnant and at the end when she resets adopted a baby but now its starting to bother me. I deleted all of my script mods and combed through my mods folder and ran the game without mods but its still the same, i tried uninstalling and reinstalling. Finally I thought that maybe if I got sims 4 get to work it would fix it if she just went to the hospital. So now my sim is a doctor and has got to level 8 and has helped a sim give birth but the women reset and there was no baby, the bassinet even appeared and my sim completed the whole deliver baby task! I dont understand why! Can someone help me out here? I only have the base game and get to work no stuff or game packs in it. my sister has the same thing happening too and she has the same amount of games and even less CC than I do.