It is better before you plan to have a bb to take 葉酸 is better. You can take 葉酸 now, and it is not late. 葉酸 is the substance to build bb spinal bone to his brain structure. You can also eat more green vegestable to take it's 葉酸. These vegestable contain rich 葉酸 and it is very easy to obsorb by yourself to your bb ga.