Multiple pregnancy

Japanese: 多胎 - たたい（英語表記）multiple pregnancy

This refers to the condition in which two or more fetuses are present in the womb at the same time. Twins are relatively common, but there are rare cases of triplets or quadruplets. As the number of fetuses increases, the frequency decreases, but there are cases in which the fetuses are delivered safely and survive. Recently, the use of ovulation-inducing drugs has led to an increase in the number of multiple births of three or more fetuses. Multiple births are more likely to cause complications during pregnancy and childbirth.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

2個以上の胎児を同時に胎内にもつ状態をいう。双胎は比較的多いが，まれには3胎とか4胎という例もあり，数が多くなるにつれて頻度は低くなるが，安産して生存する例もある。最近では，排卵誘発剤の使用により3胎以上の多胎が増加の傾向にある。多胎の場合には妊娠や分娩時の合併症が起りやすい。

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