Research : Babies born during summer are more likely to be healthy adults

  • October 13, 2015
Research : Babies born during summer are more likely to be healthy adults
Women who were born in the summer are more likely to be healthy adults, suggests new research.

Authors of a study published in the journal Heliyon, which involved almost half a million people in the U.K., say more sunlight-and therefore higher vitamin D exposure-in the second trimester of pregnancy might explain the effect.

According to the study, birth month affects birth weight and when the girl starts puberty, both of which have an impact on overall health in women as adults.

The environment in the womb leads to differences in early life-including before birth-that can influence health in later life. This effect, called programming, has consequences for development throughout childhood and into adulthood.

The researchers behind the study, from the Medical Research Council Epidemiology Unit at the University of Cambridge, found that children who were born in the summer were slightly heavier at birth, taller as adults and went through puberty slightly later than those born in winter months.

“When you were conceived and born occurs largely at random-it's not affected by social class, your parents' ages or their health-so looking for patterns with birth month is a powerful study design to identify influences of the environment before birth,” said John Perry, the lead author.

Previous studies have reported certain effects of the season of birth, for example on birth weight and various other health outcomes. Perry and the team thought that childhood growth and development, including the timing of puberty, is an important link between early life and later health, so decided to study more closely the impact of birth month.

The researchers compared the growth and development of around 450,000 men and women from the U.K. Biobank study, a major national health resource that provides data on volunteers to shed light on the development of diseases.

The results indicated that babies born in June, July, and August were heavier at birth and taller as adults. The study also found that girls born in the summer started puberty later, an indication of better health in adult life.

“This is the first time puberty timing has been robustly linked to seasonality,” said Perry. “We were surprised, and pleased, to see how similar the patterns were on birth weight and puberty timing. Our results show that birth month has a measurable effect on development and health, but more work is needed to understand the mechanisms behind this effect.”

The researchers believe that the differences between babies born in the summer and the winter months could be down to how much sunlight the mother gets during pregnancy, since that in part determines her vitamin D exposure.

“We don't know the mechanisms that cause these season of birth patterns on birth weight, height, and puberty timing,” said Perry. “We need to understand these mechanisms before our findings can be translated into health benefits. We think that vitamin D exposure is important and our findings will hopefully encourage other research on the long-term effects of early life vitamin D on puberty timing and health.”

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