When does the baby chin no longer remain on the chest?

A baby's chin typically begins to lift off the chest around 2 to 4 months of age as they develop better neck and head control. By this age, they often start to hold their head up during tummy time and when being held upright. This gradual strengthening of neck muscles allows them to explore their surroundings more effectively. However, individual development can vary, so some babies may reach this milestone earlier or later.