The hatch sound machine is designed to provide a calming environment for婴儿夜间的睡眠。It is important to note that the decibel level of the machine should be set at a minimum of 40 decibels to ensure that the sound machine does not interfere with the婴儿's ability to fall asleep. However, experts recommend lowering the volume to a level where you can still talk over it comfortably. For example, a volume between 40-50 decibels is generally recommended.
It is also important to choose the appropriate type of sound. The hatch sound machine offers a choice between white noise, rain sound, and ocean sound. While white noise is the most common sound choice, research has shown that other types such as rain and ocean sounds may be more effective at掩码婴儿的睡眠周期，并有助于安抚婴儿的大脑进入睡眠状态。
Ultimately, the decibel level and selection of sounds will depend on the individual needs of the parents and the specific needs of their婴儿. Research has shown that a sound machine should not be set to max volume for extended periods of time as this can cause hearing loss. A good rule of thumb is to use the infant or child sleep machine at a moderate volume that allows for comfortable conversation but does not interfere with the婴儿's ability to fall asleep.
