When your baby has colic, they will cry for hours on end and it's very hard to calm them down. What are the signs and symptoms of colic? And, how can you help a colicky baby sleep? This post will tell you all you need to know based on our 10+ years of experience. What is Colic? Colic is a fairly predictable time of day when your baby will cry for long periods of time. Some babies will cry for an hour or two but other babies can cry for multiple hours. My friend's baby cried for 5-6 hours