Babies typically start to sit up with support around 6 months old and can often sit up independently between 7 to 9 months of age. Some babies may show signs of readiness as early as 4 to 6 months by pushing themselves up during tummy time or sitting in a tripod position with support. Independent sitting usually emerges around 8 to 9 months, but every baby develops at their own pace, and some may take a bit longer. To help a baby sit up, tummy time is important for strengthening neck and back muscles. Supporting a baby in a seated position with pillows or holding them upright can also encourage this milestone. Watching for signs like good head control, pushing up with arms, and the ability to sit briefly in a supported position can indicate readiness to sit up independently.