How long does a 5 month old baby sleep?

5 months baby lying down to sleep for how long, in fact, there is no specific time. As long as the baby is willing to lie down to sleep, will not affect it, but also has the role of promoting digestion, exercise back muscles, exercise cardiopulmonary function. But if the baby lies down to sleep for a long time, such as lying down for more than three hours, parents should give it a change position.