Symptoms of children with developmental delay include backward physical development, backward motor development, backward language development and backward intellectual development. 1. Lagging behind in physical development: the height, weight and head circumference are lower than the normal standard, and the body is short and thin. 2. Lagging behind in motor development: uncoordinated movement of limbs, inflexibility, poor balance, inability to accurately build blocks, and small running and jumping range. 3. Lagging language development: it is difficult to understand other people’s words, or the words are not clear, unable to express their own thoughts. 4. Poor intellectual development: poor response to the outside world, low ability to recognize things around them, and low social adaptability. If the patient has symptoms of developmental delay, he should consult a doctor in time to get a clear diagnosis and actively cooperate with the treatment.