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Having a baby is energetically much more expensive than commonly thought, according to new research.

In fact, over the course of a pregnancy, creating and carrying a little one takes 49,753 dietary calories — the equivalent of 164 Snickers candy bars, said Dr. Dustin Marshall, a coauthor of the study published May 16 in the journal Science.

For the meta-analysis, Marshall, a professor of evolutionary biology at Monash…