SOY BEAN milk for infant feeding has the potential advantage of widespread availability and economy in areas where animal protein may be scarce and costly. Ernest Tso, noting the need for an alternative to cow's milk for artificial feeding of infants in China, reported in 1928 on a "more or less successful attempt to feed an infant six weeks of age for eight months on soybean milk diet,"1 which he thought to be the first such report. This infant gained well, but developed rickets refractory to treatment with cod liver oil until cow's milk was substituted to provide adequate calcium intake. From that time to this the search has continued for improved soy formulas for those areas where cow's milk feeding is impractical, and for infants with cow's milk intolerance.
Justly or unjustly, soy bean milks have been criticized for causing gastrointestinal upsets and for not being readily tolerated
Cherry FF, Cooper MD, Stewart RA, Platou RV. Cow Versus Soy FormulasComparative Evaluation in Normal Infants. Am J Dis Child. 1968;115(6):677–692. doi:10.1001/archpedi.1968.02100010679007