Children can start to sit at 6 months, 6 months old children can already sit, during the period of 5-6 months you can teach your child to learn to sit, you can learn to sit once a day, each time in just a few minutes, it is good to have the behavior and posture of sitting. Because the bones of children within 6 months are not well developed, if too much or too early sitting will lead to spinal deformities, scoliosis may occur or the spine forward to form a hunchback posture, which is not conducive to the development of the spine, so within 6 months should not sit, you can learn to sit but not sit for too long, 6 months can begin to sit normally. At the same time, we should pay attention to vitamin D and calcium supplementation at around 6 months of age, which is conducive to the growth and development of the skeleton, to avoid poor absorption of calcium due to vitamin D deficiency causing bone deformities and other phenomena.