The dangers of formaldehyde include the possibility of irritating children’s skin and mucous membranes, inducing asthma, and causing blood system disorders. Formaldehyde is a gas with an irritating odor, children inhaling formaldehyde can irritate their skin and mucous membranes. Eyes can be irritated by congestion, itching; respiratory mucous membrane irritation can appear throat discomfort, sore throat, hoarseness and so on. Skin irritation after the appearance of rashes, hives and other symptoms of allergy. Formaldehyde can also induce asthma attacks in children, severe cases can appear chest tightness and shortness of breath and breathing difficulties. Formaldehyde can also affect children’s bone marrow hematopoiesis, thus causing children to suffer from leukemia, lymphoma or other blood system diseases; it can also increase the incidence of other malignant tumors. In addition, formaldehyde has an irritating effect on children’s digestive tract, which may cause diarrhea or bloody stools. In summary, formaldehyde has the above hazards to children, it is recommended that children should be avoided exposure to formaldehyde. If necessary, it is necessary to consult a doctor in time to standardize the diagnosis and treatment.