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目的：比较不同喂养方式与婴儿腹泻及呼吸道感染的关系，探讨母乳对婴儿感染性疾病的影响。方法：通过放射免疫方法测定婴儿粪便的ＳＩｇＡ含量，采用随访方式调查婴儿腹泻和呼吸道感染的发生率。结果：在出生后１～４月，母乳喂养儿粪便的ＳＩｇＡ含量明显高于人工喂养儿，而母乳喂养儿腹泻和呼吸道感染率在６个月内均显著低于人工喂养儿。结论：母乳能减少婴儿腹泻及呼吸道感染的发生，母乳中的ＳＩｇＡ是保护婴儿免受感染的重要物质。
Objective: To compare the relationship between different feeding methods and infantile diarrhea and respiratory tract infections, and explore the effect of breast milk on infant infectious diseases. Methods: The content of SIgA in infant feces was determined by radioimmunoassay. The incidence of infant diarrhea and respiratory tract infection was investigated by follow-up. Results: In the first four months after birth, the SIgA level in breastfeeding children was significantly higher than that in artificial feeding children. However, the rates of diarrhea and respiratory infection in breastfeeding children were significantly lower than those of artificial feeding children within 6 months. Conclusion: Breast milk can reduce the incidence of infant diarrhea and respiratory tract infections. SIgA in breast milk is an important substance for protecting infants from infection.