The problem of drug safety for newborns and children is very serious. According to data from the Adverse Drug Reaction Monitoring Center of the Ministry of Health of China, the incidence of adverse drug reactions in newborns is as high as 24.4%, which is four times that of adults;the incidence of adverse reactions in children was 12.9%, twice that of adults. This means that one out of every four newborns who use drugs will suffer from varying degrees of organ damage due to drug adverse reactions, such as drug-induced deafness, nervous system damage, liver and kidney function damage, etc. Therefore, in order to protect the health of the child and avoid serious adverse drug reactions, it is very important to obtain the child's pharmacogenetic information as soon as possible.