The initial symptoms of formaldehyde poisoning in children are as follows: 1. The manifestation of respiratory tract poisoning, after children appear formaldehyde poisoning, they will cough, cough phlegm, tear, sneeze and have difficulty in breathing, etc. This situation is often due to the new move into the house or after entering a new environment, the corresponding symptoms will be obvious. 2. The children’s formaldehyde poisoning will also be manifested as gastrointestinal reactions at the beginning, and the children will experience nausea, vomiting, dizziness, weakness and other uncomfortable symptoms. 4. The children’s formaldehyde poisoning will be significantly reduced after leaving a certain environment.