What noise is best for baby sleep?

Gentle, consistent sounds tend to work best for baby sleep, because they mirror the whooshing environment of the womb and mask sudden changes in noise. Traditional “white noise” is one option, but many parents prefer slightly softer “pink” or “brown” noise, which sound more like natural sounds for example rain, waves, or distant wind and are less harsh. Nature sounds or a low fan can work similarly if they are truly steady and not too stimulating. Whichever sound you pick, keep it simple and boring rather than musical or voice based, which might actually keep some babies awake. The exact type matters less than safe volume, distance, and being part of a consistent bedtime routine.