We apologize that your brand new unit is making this rattling noise right out of the box. We will gladly make this right for you. Our products have a one year warranty and we stand behind our products. Please contact us directly at Hello@yogasleep.com and we will walk you through the warranty process.
Angel Barnhill - Yogasleep
Thank you for reaching out. This is a great question! We recommend placing our sound machines (including Rohm, Hushh and Dohm models) at least three feet away from the baby. This rule of thumb applies to all users. You may also find this FAQ that talks about decibel levels interesting as well.
If you have any further questions please don't hesitate to reach out 800.999.6962 or via email email@example.com
Best- Sara - Yogasleep Customer Care