Usually, moving in within 6 months after a new renovation may increase the risk of leukemia in children, but it cannot be generalized and is related to factors such as one’s own constitution. Leukemia is a class of malignant clonal diseases of hematopoietic stem cells, the causes of which mainly include viral factors, chemical factors, genetic factors and related disease factors. New renovation generally releases formaldehyde, benzene, ammonia and other irritating harmful gases, among which formaldehyde and benzene are one of the important factors that induce leukemia. High concentration of formaldehyde can damage human cell proteins and cause acute poisoning, manifested as burning pain in the throat, breathing difficulties, pulmonary edema, allergic purpura, allergic dermatitis, jaundice, liver and immune function abnormalities, etc. It is recognized as a suspected carcinogen by the International Association for Research on Cancer. Benzene can be absorbed into the body by the respiratory tract and skin, and can be toxic in high concentrations, causing changes in human blood and hematopoietic function, which may induce leukemia. However, it should be noted that, although just after renovation to move in to a certain extent will increase the chances of leukemia, but not necessarily all will get leukemia. Secondly, the suitable time to move in after the new renovation varies from person to person, normal people can consider moving in after 3 months, pregnant women at least 4 months, infants and children are recommended to move in after 6 months, so as not to prematurely move in and endanger health.