Baby Owned Movements

My son crawled at 9 months, sat at nearly 10 months, and walked at 16 months. According to developmental charts, his sitting and walking are considered to be within the later range of ‘normal.’ Charts indicate that babies sit at six months when placed in sitting by an adult. The baby does not own that movement of sitting by being able to move in and out of positions. Most are actually stuck in sitting and struggle to get ‘unstuck.’