We recommend consulting with your physician before beginning any new prenatal practice, however, we suggest limiting your use of BellyBuds to 1 hour a day. Also, we recommend first determining if your baby is awake so as not to disturb their sleeping pattern unnecessarily. While still in the womb, fetuses, like newborns, sleep most of the time - heading into the 3rd trimester babies are awake on average between 2 to 4 hours a day. This is the optimum time to sing, read, talk to, play music or play voices to your belly. Up to a half-hour session twice a day is a recommended usage time.