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Before the 20th century, babies born with congenital lactase deficiency often did not survive,[2] but death rates decreased with soybean-derived infant formulas and manufactured lactose-free dairy products.[28]
20세기 전에는 선천성 락테이즈 결핍인 아기들은 많이 죽었었다. 하지만 soybean관련 이유식이 나오고 나서 사망률이 감소하였다.
https://en.wikipedia.org/wiki/Lactose_intolerance