Infants are lost in the world

The parents left the home lot to go to the park for a quest. The triplet infants were left with the nanny, two were in the crib and the nanny was holding one. When the parents returned to the lot, one infant was on the floor, the nanny was just getting to the lot and two infants were lost in the world crying on the ground.

This has been an issue since infants were introduced to the game, whether you have base game or the Growing Together pack. I am not playing the game with mods. I started a new game after the update.