Your question doesn't make sense. Folate is a nutrient you get from food and/or supplements. Nutrients do not need cures.
the answer is folate.
to prevent birth defects
The vitamin is Folic Acid.
Folate/folic acid
The neural tube forms the spinal cord and brain. Mistakes in the formation of these structures seems to be more common in folate deficiency. Women who may become pregnant are advised to take folate to prevent these birth defects.
Neural tube defects.
You cannot eat or drink anything for 8 to 10 hours before having a folate blood test. This test is done to check for anemia, malnutrition, and to ensure birth defects do not happen to a fetus.
Folic Acid is usually recommended to women. It is normally taken before you get pregnant as it is used to help prevent Spina Bifida. It has been shown that a developing baby needs this supplement to develop.By the time you know your pregnant the neural tubes are developed. Having said that you can eat green vegetables and other foods that contain folic acid.
Before the mid-1990s, about three quarters of neural tube defects could be traced to low folate levels in the mother. Since foods (mostly cereals) and prenatal vitamins now contain folate, there has been a 75% decrease in the rate of neural tube defects in the U.S. So, nowadays, the percentage of neural tube defects related to the mother's lack of folate intake is quite small, although the exact percentage has not been studied.
No he did not have any birth defects.
There are thousands of identified birth defects. Birth defects are abnormal developments present at birth that can cause physical or mental disability. Some, but not all are fatal.
The most common one is Folic acid or folate which is a B vitamin. It is also referred to as vitamin B₉.