Thanks to the propaganda of popular scientists and the power of internet communication, the problem of strabismus has attracted the attention of mothers and fathers, which is a good thing, because the earlier the strabismus is detected, the earlier the intervention and the better the prognosis. However, this spread also has the side effect that the incidence (currently reported to be no more than 2%) is not low but not so high that it has become a must-ask question for mothers and fathers. Even the normal sleeping head tilt of the baby has to be torn for half a day. It seems that the baby can only sleep straight and symmetrical, turn over, twist a head, a little artistic pose can not! But is that the case? Can a normal baby who does not pay attention to sleeping position really cause a squint? (Except in extreme cases) The answer is: NO Why? The etiology of the squint is not clear, but it is clear that it has nothing to do with the acquired sleeping position and normal activities. The direct cause of the squint is the contracture and shortening of the sternocleidomastoid muscle due to fibrosis. However, there are many opinions on the real cause of this muscle fibrosis and there is no unified understanding. It is usually believed that the fetal neck is twisted in utero, and that the ischemia and edema of the sternocleidomastoid muscle due to intrauterine position restriction until delivery leads to fibrosis and contracture. It is also believed that the sternocleidomastoid muscle was damaged during delivery, resulting in hematoma, fibrosis, and contracture within the muscle. Some moms may ask, “My baby just likes to sleep on the wrong side of the head, and when I went to the hospital, it was a squint. What makes you say it has nothing to do with sleeping position? In fact, this is a typical reversal of cause and effect, just like many moms think that coughing becomes pneumonia and fever burns the brain. In fact, there is a tilt neck in the first place, and the tilt neck causes a deviated head in the second. If you find that your baby’s head is always tilted to one side, you should indeed be alert to the possibility of a squint, which is easy to detect when it is obvious, but often easy to ignore when it is mild. Because the sooner the squint is treated, the better the prognosis, it is recommended to go to the hospital for the doctor’s help when you can’t tell. If your baby just likes to sleep to one side, but can naturally turn and tilt his head from side to side, this is not indicative of squinting.