主要理由有以下：
1.The placenta transmits lipids and vitamin K relatively poorly.
2.The neonatal liver is immature with respect to prothrombin synthesis.
3.Breast milk is low in vitamin K, containing about 2.5 μg/L (cow's milk contains 5000 μg/L).
4.The neonatal gut is sterile during the first few days of life.
相關內容可以參考Merck Manual
以上內容感謝彰基藥師bao yuan的分享
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