Toddlers and Infants have no sound

I'm not actually sure if this is a bug but I can't find anything on it anywhere. My two twin toddler boys and infant girl are silent. They make the movements and gestures for the sound, but make no sound whatsoever. The adult parents are just fine. This started after we traveled to selvadorada for a family vacation and they were sent to day care. Maybe it's the daycare mod? But again, I'm not seeing anything on this specific topic anywhere.