Capillary bronchitis is a respiratory infectious disease specific to infants and children under 2 years of age and is related to the anatomical characteristics of the capillary bronchi in this age group. Parents can also find obvious clinical signs, such as shallow, fast breathing, about 60-80 times per minute; heart rate of 160-200 times; nasal flapping, pale face in severe cases, and parents can hear a lot of wheezing sounds when they put their ears close to the chest. This disease is easily combined with heart failure, which may be life-threatening at any time; the following briefly tells parents how to observe some medical knowledge of heart failure. Firstly, whether there are changes in breathing and heart rate as mentioned above; secondly, whether the child is obviously irritable or depressed; secondly, whether the child’s urine output has decreased significantly in the last few hours; usually children with normal urine output will not have heart failure; finally, I would like to tell parents that once your child has obvious coughing and wheezing symptoms, the most direct and effective way is to seek medical attention. We hope your child will grow up to be healthy!