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According to a survey of 13,000 families in Japan, the birth order of children does not affect the risk of asthma or eczema positively or negatively. However, according to the results of research and surveys, first-born children are at higher risk of developing food allergies than their siblings.
Japanese scientists claim that the rate of food allergies in first-born children is 4%, second children 3.5% and later births 2.6%. He is currently conducting research at Kyoto University. Takashi Kusunoki says that the relationship between birth order and allergy risks has not been fully clarified, and that they will deepen their research to reach a definitive conclusion.