Dr. Chiang explains that in addition to hereditary factors, the "environment" in which the fetus develops during pregnancy is also very important. If the expectant mother suffers from a serious allergy, she can pass on the allergy to the fetus through the placenta, making it much more likely that the child will be allergic after birth. Pregnant women must therefore take all sorts of precautions.
江伯倫指出，除了遺傳基因外，母親懷孕時胎兒所處的「環境」也很重要，媽媽懷孕時如果過敏情形嚴重，會將過敏抗體通過胎盤傳遞給胎兒，孩子出生之後便更容易產生過敏，因此懷孕期間必須處處小心。