Among those pregnancies, more than 4,000 were babies born excessively heavy, defined as being in the 90th percentile for weight.
Researchers found first-time mothers, who exercised at least three times a week during pregnancy, were less likely to have bigger babies.
The relationship between exercise and excessive birth weight was not as conclusive for women who had given birth previously.
The study appears in the October issue of the journal Obstetrics & Gynecology.
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