Heart rate variability, or HRV, is a metric often computed by a biofeedback machine to determine the regularity of a heartbeat. It compares the time between each beat, to determine how steady your heart performs.
1 When your baby is getting sleepy, put your baby in his or her crib in a quiet, darkened room. 2  This will help your baby learn to go to sleep in his or her crib. 3  Don't rock your baby to sleep after about age 4 to 6 months. 4  Rock your baby, but lay the baby down to sleep while he or she is drowsy but still awake. Give your baby a bath, sing lullabies, read a book, or tell a story. 2  These activities can help your baby relax. 3  They also signal that it is time to sleep. 4  Don't get your baby excited with active play right before sleep. 5  When your baby is getting sleepy, put your baby in his or her crib in a quiet, darkened room.
Your baby needs lots of sleep. The average newborn sleeps for up to 16 hours a day, although it may not feel like this much to you! At first your baby will need to wake up frequently for feeds, probably every three hours to four hours in the day, with longer spells at night.Find out more about how much sleep your baby needs.he average newborn sleeps for up to 16 hours a day, although it may not feel like this much to you! At first your baby will need to wake up frequently for feeds, probably every three hours to four hours in the day, with longer spells at night.