Kids have waists too.
The lumbar region is one of the important bodily structures of the human body that exists in every human being and is usually formed during the embryonic period. The lumbar region is the collective name for some of the organs of the body and has a variety of important functions. Organs such as the kidneys are also located in the lumbar region.
If a child’s lower back develops normally, he or she will be able to sit, roll, crawl, etc. at a certain age, and walk normally around the age of one. However, if the child’s lower back develops abnormally or has congenital deficiencies, it may affect normal activities and lead to spinal deformities.
Try not to let your child sit or walk for long periods of time before the age of one, as this may lead to injury to the lumbar spine or the spine. If there is any discomfort, seek medical attention.