Sleeping on your 30 day old baby’s back is generally not recommended and can lead to things like suffocation. Generally speaking, there are no strict rules for the sleeping position of the baby, but if the baby chooses to sleep on his stomach, it is required that the baby’s waist muscles and neck muscles are more fully developed. And the baby was just born 30 days, his waist and neck muscles are not fully developed, can not support the baby in the lying down to raise his head, so if there is no parent in the side of the care, the baby sleeps on his back may cause the baby to appear breathless, suffocation or misinhalation and so on, and may also be on the baby’s heart to produce compression and so on. Therefore, it is generally not recommended that babies sleep on their stomachs, and it is recommended that babies adopt the supine position or side-lying position.