The 4-month sleep regression is a term often used by parents to describe a period of disrupted sleep that many infants experience around the age of four months. This phase is deemed quite normal and is commonly attributed to significant developmental changes occurring in a baby's brain. At this stage, infants become more aware of their surroundings and begin to develop skills such as rolling over and more complex cognitive abilities, which can lead to disturbances in their sleep patterns.

During this regression, parents may notice that their previously good sleepers are waking more frequently during the night, having difficulty settling down, or developing a resistance to nap times. It can be a challenging period, but understanding that this is a normal part of development can help parents navigate the disruptions with a sense of reassurance. Ultimately, the 4-month sleep regression is a temporary phase, and with patience and consistent routines, most babies will eventually return to more stable sleep patterns.