I purchased the white noise machine when my daughter was newborn - she's 9 months now and it's our most used baby item by far! Maya took a liking to the 'waves' sound and we have used this for every nap time ever since. She self soothes and the machine is left on all night. The battery is also something that gives this product its 5 stars - we literally charge it once a week if that! I bought my sister in law one for her new arrival and I am going to be ordering my sister one in time for her due date also due to the fact that we couldn't be without ours!