If you are a new parent desperately Googling "how to get my baby to sleep," you've likely seen sound machines recommended everywhere. But why are they so effective? The answer lies in the "Fourth Trimester." For nine months, your baby was surrounded by the constant, loud swooshing sounds of your heartbeat and blood flow—which can be as loud as a running vacuum cleaner!

The Ferber method is often misunderstood as leaving babies to cry alone, but its true purpose is teaching self-soothing with gradual, timed check-ins. Dr. Richard Ferber himself explained it’s about helping babies settle without panic, while child development expert Ana Adame notes that crying can be part of building emotional wiring when paired with consistent co-regulation. This article answers the questions parents actually search for—like how to use Ferber with breastfed babies, whether to wait after reflux or colic, and how to adapt the method for sensitive little ones.