@dlarlQma Do your sims use a baby monitor? If so, turn it off. And don't let the infants and toddlers get to the point where they're screaming their heads off. Regular crying, for example what you'd see when a baby just became hungry or wet the diaper, doesn't wake up my sims, but the constant screaming of an extremely low need does.
If that doesn't help, try moving the nursery farther away from the other bedrooms. I've never had an issue with sims waking up when the baby cries if they're a couple of rooms away. Then again, half the time I let the babies and toddlers sleep outside on the back porch. They don't seem to mind.
