Watermelon seeds are rich in magnesium. You can get 21mg of magnesium from a 4grams serving of watermelon seeds. The FDA recommends adults to get 400mg of this mineral daily. Magnesium is essential for many of the body’s metabolic functions. It’s also required to maintain nerve and muscle function, immune system, heart, and bone health. Having adequate amount of magnesium during pregnancy is known to prevent the uterus from contracting prematurely. It also helps build strong teeth and bones in your baby. In addition to this, the folate content in these seeds, helps prevent neural tube defects in your unborn child.