Answer: Baby may feel feeling sleepy,Wet or dirty diaper,Hunger,Overstimulation from noise or activity colic, acid reflux, or food allergies,pain or illness Gas,Stranger anxiety or feargenerally feeling colic is the reason of crying, do cycling type with baby leg regularly that helps to gas out, and baby will feel. You have to pay attention mummy to your baby, you can't be perfect all time, but you will be able to understand gradually the reason of baby crying.