The most common neural tube defects are spinabifida, in which the spin al cord fails to close completely during fetal development, and anencephaly, in which part or all of the brain doesn't develop.
Daily supplementation with folic acid for 1 month prior to conception and during pregnancy may reduce the incidence of neural tube defects such as spinabifida and anencephaly in the child.
在怀孕前一个月及怀孕过程中对叶酸的补充会减低胎儿患神经系统疾病的机率,例如脊柱裂和脑血管畸型。
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The concentrations of the free amino acids in the amniotic fluid of the anencephaly fetus were raised markedly whilst those of the spinabifida fetus were lower than normal.