We all know that babies cry very often, but it’s not easy to know why. Sometimes we know the reason, but we hesitate if it’s adequate to satisfy him: “he is tired and he can not sleep. Must I help him to sleep holding on arms, to keep him company…”, “it seems that he is hungry, but it’s not time to eat yet, must I advance the meal?”, “must I holding on the baby bag pack very often or is he going to spoil to be in arms every time?”.

What are psychologists' opinion about these subjects: is it better to avoid a baby crying or is it better that he gets used to schedules, playing alone, sleeping alone, etc?