Correct

阵痛

/ zhèntòng / 
Strokes

Definition

labor pains

Example

As a Noun

labour pains; birth pang

1
Liǎngdiǎn
两点
kāishǐ
开始
zhèntòng
阵痛
  
。

The labour pains started at two o'clock.

2
Jīè
饥饿
yǐnqǐ
引起
de
的
zhèntòng
阵痛

pangs of hunger