In the United States, England and Spain, among other countries, July is the month in which more boys and girls are born, followed by August . Paul Sutton, an expert in demography at the United States Center for Disease Control (CDC), suggests that this trend is explained by the fact that in late fall and early winter people tend to spend more time at home and give themselves more opportunities for pregnancy. The result comes nine months later, that is, in summer.
However, summer births have a downside . According to a study by the University of Teal Aviv (Israel), children born during the summer are 25% more likely than those born in winter to suffer myopia . According to the researchers, it is due to changes in the production of the hormone melatonin in the pineal gland , which regulates the length of the eye: more sun means less melatonin.
