The younger the child is, the thinner the blood vessels and the more difficult it is to perform venous blood collection. At this age, there is no significant impact on the child’s body and no blood loss. The biggest possibility is that the child will cry when the blood is drawn and the parents will be distressed; in addition, the child may be frightened, which will have a certain impact on the child’s spirit, but it will not affect the child’s development. We need to see whether the advantages outweigh the disadvantages or the disadvantages outweigh the advantages when we perform a blood test. If the child’s illness requires a blood test, then there is no room for negotiation and the child will have to have venous blood drawn, even if the child is crying. If the child can be drawn or not, then as far as possible, the child should not be given venous blood. After all, the child’s age is too young to find the blood vessels when drawing blood, and violent crying will cause the child to create a certain psychological barrier, which will lead to the child to go back to the hospital and create a psychological shadow.