How do you console a baby that seems to refuse to go to sleep at night? Studies show that carrying your baby for five minutes will soothe them and promote sleep. The movement will slow their heart rate and eventually put them to sleep. Once your baby falls asleep in your arms, wait 5-8 minutes before putting them back in their crib. This last step is crucial to making sure your baby will stay asleep, as the study has shown that one-third of infants woke up within 20 seconds of being laid down again if their parent did not sit with them for those few minutes.