If a three-month-old baby has a large or small face, the first thing to look at is whether the degree of the large or small face is serious. Everyone’s face is asymmetrical, and there are different degrees of face size, if the degree is not very serious, you can continue to observe. You can adjust the details of your life, such as sleeping on the side of the face that is larger, and you should also switch sides when feeding each time. This way, you can change your position and make a slight adjustment to the shape of your head and face. If the size of the face is severe, and the head is always tilted to one side, and the head is also tilted to one side when sleeping, it is important to consider whether there is a congenital squint that causes the size of the face. If there is a suspected squint, you should go to the hospital for ultrasound examination.