What tablets to use while planning pregnancy? 

If you are trying to get pregnant, you should take folic acid tablets (400 micrograms) every day. Taking folic acid when you are trying for a baby and for the first 12 weeks of pregnancy reduces the risk of having a baby with neural tube defects (where parts of the brain or spinal cord do not form properly), such as spina bifida.

What are common cause for infertile ?