Generally, babies' crying tends to decrease significantly around 3 months old, with many babies crying an hour or less per day by this age. However, some babies may continue to cry regularly until they are about 5 months old.
Babies cry as a way to communicate their needs, such as hunger, discomfort, or the need for attention. As they develop other ways to interact and their nervous system matures, the frequency of crying usually decreases.
It's important to remember that every baby is different, and there is a wide range of normal when it comes to crying. If you're concerned about your baby's crying, it's always best to consult with a pediatrician.