Folic acid works, but it only works if taken before and during the first few weeks of pregnancy, when the neural tube is developing into the brain and spinal cord.

如果您在怀孕前或者怀孕的前几个星期内，也就是在神经管开始形成脑和脊髓的时期，叶酸可以起很重要的作用。

youdao

Folic acid works, but it only works if taken before and during the first few weeks of pregnancy, when the neural tube is developing into the brain and spinal cord.

如果您在怀孕前或者怀孕的前几个星期内，也就是在神经管开始形成脑和脊髓的时期，叶酸可以起很重要的作用。

youdao