Effects of vitamin B12 on fertility

In addition to promoting blood cell production and nerve activity, the effects of vitamin B12 are also shown by increasing fertility for both men and women.
In addition to promoting blood cell production and nerve activity, the effects of vitamin B12 are also shown by increasing fertility for both men and women.
The health of mother and baby during pregnancy is of utmost importance. So what should pregnant mothers eat to provide more nutrients for their children without being overweight?
In fact, children with vitamin B deficiency can face many dangerous medical conditions. So what should mom do to prevent this problem from happening?