As the saying goes, “The opportunity of the year lies in spring.” Spring is a wonderful season for couples who want to have a child. According to Israeli experts who followed six hundred and fifty women who underwent artificial insemination for four years, the change of seasons had a significant impact on women’s pregnancy and fertility, with spring being the best season for conception and the highest success rate. Adequate sunlight is one of the benefits of spring pregnancy. The ergocalciferol in the skin turns into vitamin D when exposed to ultraviolet light from the sun, and vitamin D helps to regulate a woman’s ovulatory cycle and promote ovulation. Also vitamin D promotes the absorption of calcium and phosphorus, which is beneficial to the growth and development of fetal bones. In addition, sunlight on the skin can promote the body’s blood circulation, but also sterilize and disinfect the body, which is also beneficial to the health of pregnant women. For men, more sunlight can significantly increase their testosterone content, thus improving male sperm secretion and sperm vitality. Studies have shown that for every hour of sun exposure, testosterone can increase by 69%. With sun exposure, 90% of the vitamin D in the body is produced by the skin, and the level of testosterone in the human blood rises with the increase of vitamin D content in the body. Researchers at the Medical University of Graz in Austria found that men with at least 30 nanograms of vitamin D per milliliter of blood had much higher levels of testosterone than those with vitamin D levels below 30 nanograms per milliliter of blood. Those couples who are trying to conceive a baby should get out and about when spring is in full bloom.