Here's How Long You Should Really Wait Between Pregnancies, According to New Research

It’s not the same as the World Health Organization’s recommendation.
ByStephanie Grassullo
Associate Editor
Oct 2018
pregnant woman with her young child
Photo: Getty Images

Mothers should wait at least a year between giving birth and getting pregnant again, according to new research. This differs with the World Health Organization’s guidelines, which recommend women wait between 24 and 18 months.

Smaller gaps between pregnancies can risk premature birth and infant mortality.

For the study, researchers observed 150,000 births in Canada and found 12 to 18 months was the ideal time to wait between giving birth and becoming pregnant again. They hope the news will reassure women over 35 years old who are trying to grow their family.

“Achieving that optimal one-year interval should be doable for many women and is clearly worthwhile to reduce complication risks,” senior study author Wendy Norman says.

The researchers also found all women, regardless of their age, who got pregnant less than 12 months after giving birth had pregnancies associated with more risks. There was only a risk for the mothers when they were older than 35, but in all cases their was a risk for the babies. The highest risk for babies was from women who were between 20 and 34 years old.

Women older than 35 who got pregnant six months after giving birth had a 1.2 percent risk of maternal mortality. Younger women who got pregnant six months after a previous birth had an 8.5 percent risk of premature labor. This dropped to 3.7 percent if they waited 18 months between pregnancies.

The American College of Obstetricians and Gynecologists is pretty aligned with these findings. It also suggests women should be advised to avoid interpregnancy periods of less than six months and "should be counseled on the risks and benefits of repeat pregnancy sooner than 18 months.”

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