Around that time babies develop more internal organization of their sleeping patterns. Exciting developmental changes occur that lead babies to the promised land of fuss-free living. They can see clearly across the room. Babies are so delighted by the visual attractions that they forget to fuss. Next, they can play with their hands and engage in self-soothing finger sucking.
Babies can enjoy more freedom to wave their limbs freestyle and blow off steam.
Also, during the second half of the first year baby s intestine is more mature, and perhaps milk allergies subside. Or by this time the cause has been found or comforting techniques perfected. Like pregnancy and labor, colic too will pass. My daughter slept with us until she was 4. Since we've moved her into her own bed, she has nightmares.