Under normal circumstances, a 4-year-old child’s body temperature of 37.1 ℃ is not considered a fever, and a child’s body temperature of 37.3 ℃ or less is within the normal range, so a child’s body temperature of 37.1 ℃ is a normal temperature, parents do not need to worry, but in daily life parents need to take care of their children, to avoid colds and fevers in children. Parents should add or subtract clothing for the child according to the weather changes and the temperature level to avoid the child catching a cold or flu. Children should also be put to bed regularly to avoid staying up late. Children also need to supplement nutrition, meals should be balanced, nutrition should be comprehensive, to avoid the phenomenon of picky eating, partiality. Parents also need to encourage children to participate in outdoor sports to increase immunity.