When babies are born, has to adapt gradually to their surroundings, so you will notice that early wake up constantly, but this behavior is part of a logical adaptation.
Up to 3 months and while the hemispheres of their brain are developing, the first mission that has little, is learning to distinguish times and adapt to the day’s activities and rest during the night.
As time passes and reached the 4 or 5 months, perhaps a little more because not all children develop in the same way, is when newly his biological clock is able to properly regulate wakefulness and sleep cycles when there is a presence of light, as well as also to distinguish when it is time to feed or interact with people who are in their care.
So when he wakes up crying all the time compared to everyday noises, does not mean you are awake, may be perhaps transiting an uneasy dream, or that has not slept at all and try to get to that point that allows you to rest.
Let us keep that if we go quickly when the baby makes the first level, we will not provide the opportunity to learn to sleep alone, we should not force him to sleep, but rather provide those things that are necessary for the small to recognize and do it yourself, from an early age.