The most suitable months of the year for pregnancy are generally in the spring and late summer and autumn, that is, between March and April and between July and September is better, but of course, this also has a certain relationship with the local climate. Generally speaking, in March-April and July-September each year, the incidence of infectious diseases is relatively lower, and because the outdoor environment is at a suitable temperature, not too cold and not too hot, pregnant women can go to the outdoor environment after pregnancy, to better receive the sun bath, synthesize vitamin D to promote the absorption of calcium, which is conducive to the prevention of calcium deficiency during pregnancy and the development of fetal bones. During these two periods, fresh seasonal fruits and vegetables are also more abundant, so pregnant women can have more dietary choices and supplement various nutrients.