The manifestations of neonatal diseases are: 1. diet: little or no food, refusal or vomiting of milk, etc.; 2. diarrhea: delayed discharge of fetal stool, delayed urination, low urine volume, abnormal color of urination; 3. sleep and mental status: excessive sleep time, difficulty in waking up, no feeding time; no crying, no movement, noisy crying or crying in the wrong voice; 4. skin color: blue skin color, bruising, pale; 5. appearance: special facial features, deformities; 6. respiration: uneven, more superficial or suspended breathing.