Developmental abnormalities in children are defined as the absence or severe lag in a child’s behavioral response at a certain age compared to the child’s normal growth and developmental indicators. In general, abnormal child development includes the following: abnormal visual development: 1, the child’s eyes often appear to stare dull, unable to turn with the movement of people or toys; 2, the child can sometimes follow near with the gaze of brightly colored, large objects, but does not respond to more distant, or not brightly colored targets; 3, the child rarely use their hands to grasp the hanging on the cradle of the can not make a sound The child’s eyes show obvious abnormalities, such as strabismus, cloudy eyes, and nystagmus; 5. The child often falls because he or she cannot get around the more obvious obstacles. Abnormal auditory development: 1. The child rarely reacts with surprise to sudden sounds, such as crying, jumping in surprise, or stopping an ongoing action; 2. The child only understands some of the words when looking at others, or needs to repeat them several times to understand their meaning; 3. By the age of 12 months to 18 months, the child is still not imitating speech behavior. 5. The child often vomits, or complains of earache or head buzzing. Abnormal intellectual development: 1. The child’s appearance is peculiar; the head shape is obviously large (or small); the face shows abnormal features of a wide nose, wide eye spacing, and a stretched-out tongue; the skin color is abnormal (purple lips, hands, and feet); 2. The child’s developmental speed, such as the appearance of laughing, lifting the head, sitting, standing, and walking, is more than 4 to 5 months behind that of children of the same age; 3. The child’s performance is too “quiet” and “honest”, such as sleeping a lot, not moving well, not making noise, not crying, and not responding to parents’ teasing; 4. The child’s behavior and emotions are somewhat special, such as having difficulty swallowing or chewing, staring with both eyes or nystagmus, and often appearing irritable and Screaming and other phenomena. Warm tip: Once a child has developmental abnormalities, he or she should seek further diagnosis by medical experts in a timely manner, and should not be delayed, otherwise, it will be too late to delay the child’s condition.