Lulla Doll Is Unique. The Lulla Doll helps babies go to sleep and stay asleep. She actually plays a real life recording of a mothers heart beat and breathing for up to 8 hours. Unlike white noise devices, she wont turn off after 15 minutes allowing baby to wake again needing intervention from you as a parent. A Neutral Colour makes it ideal for boys and girls, the Outer fabric is a soft natural cotton blend making it safer and absorbs parents scent. Further, it is machine washable!