Why is there a circle of hairless hair on the back of my baby's head?

It is normal for newborn babies to have no hair. As the baby grows day by day, hair will slowly appear. By the time the baby is one year old, the hair will basically be fully grown. There is just one special case where some babies have a circle of hair missing on the back of their heads, which makes them look a little strange. So, what is the reason why there is a circle of hairless baby's head?

Generally speaking, the occurrence of occipital baldness is related to the stimulation of sweat. Babies have a relatively active metabolism and are lively and active. The sympathetic nerves that control their sweat glands are relatively excited, so they sweat more easily, especially within the first half hour of falling asleep. There are also some parents who are always worried that their babies will catch a cold, so they wrap them tightly, making the children sweat. The sweat irritates the skin on the head and the baby feels uncomfortable, but he cannot get up by himself, so he can only rub his head back and forth. Over time, the hair on the back of the head will be rubbed off and baldness will occur. As the baby grows up, his gross motor skills continue to develop, his sleeping positions become more diverse, and he can turn over and no longer needs to lie down and rub the back of his head, the phenomenon of baldness on the back of his head will gradually disappear.

In addition, the texture of the pillow will also affect the occurrence of pillow baldness in babies. Scholars have conducted experiments, selecting pillows of different hardness made of different materials, and found that the harder the pillow, the more likely the baby will develop pillow baldness when the baby shakes his head back and forth and rubs the pillow. So, is it better to give them a soft cotton pillow? Compared with pillows made of hard materials, soft cotton pillows are indeed less likely to cause pillow baldness due to friction. But in fact, newborn babies generally do not need to use pillows, because when using a pillow, the baby's head will be higher than the body and the neck will passively form a bend, which is not only not conducive to the baby's smooth breathing, but may also affect his future development of bones and spine.

The above is the introduction about the circle of hairless on the back of the baby's head. In short, babies who drink milk normally before the age of one are unlikely to be calcium deficient. If symptoms of calcium deficiency appear, it is likely caused by a lack of vitamin D in the body, so daily supplementation of vitamin D must be taken seriously.