OBJECTIVE To study on a new calculation method of newborn baby 's expected date of confinement ( EDC ), reporting the difference between birth and expected date ( DBED ) .
目的：研究福州地区新生儿实际出生日期与预产期差异（预产日差DBED）的基本规律，以及与传统预产期计算公式的异同点。
new/newborn baby