Exercise Won’t Affect Breast Milk, Baby’s Growth: Study

FRIDAY, June 22 (HealthDay News) — Breast-feeding mothers
sometimes worry that exercise may affect their breast milk — and
ultimately their baby’s growth. Now, researchers who re-evaluated the few
published research studies that exist say it does not appear that mom’s
workout will affect her infant’s growth.

Studies are sparse, according to Amanda Daley, a researcher at the
University of Birmingham in the United Kingdom, who led the analysis. She
and her colleagues searched databases and found only four studies
scientific enough to re-evaluate.

The analysis is published in the July issue of Pediatrics.

While exercise appears to have no effect on growth, research is so
sparse that Daley said she can’t make her conclusion any stronger.
“Rather, we are saying, based on the evidence we have, exercise does not
appear to negatively influence gain in weight,” she said.

“The evidence is suggestive, not conclusive,” Daley said.

Complete data from the studies were reported on 160 women, including 71
in the intervention groups and 89 in the comparison groups.

The studies looked at exercise interventions lasting at least a week.
The comparison groups were assigned either to do less exercise than the
other group or to do no exercise.

The women were exclusively or mainly breast-feeding. Information on the
babies’ weight and, in one study, length, were recorded.

Mothers’ exercise did not appear to affect infant weight gain, Daley‘s
team found. In the one study that looked at infant length, no differences
were found in the exercising or non-exercising mothers.

The concern about exercise stems from previous research that suggested
that a mother’s workout may drain the body of fluid and in turn reduce
milk volume, or that lactic-acid concentrations after exercise might
affect breast milk’s taste. But experts say the lactic-acid effect on
taste would probably occur only with very vigorous exercise, much more
strenuous than most new mothers might do.

In the studies reviewed, the women in the exercising groups did
moderate to hard-intensity exercise three to five days a week or light to
moderate exercise most days.

Daley said she can’t address concerns people might have over more
vigorous activity. For example, she said, “I can’t comment on the issue of
marathons, as none of the studies includes this type of exercise.”

But, Daley concluded: “Based on limited evidence, we found that
breast-fed infants whose mothers exercised did not gain less weight than
infants of sedentary mothers.”

Daley said a new study is needed that includes information on the
baby’s body length, the frequency and duration of breast-feeding,
fussiness, milk volume and milk composition.

Dr. Richard Schanler, chair of the American Academy of Pediatrics
section on breast-feeding, reviewed the analysis.

“I basically have no concerns about maternal exercise during
lactation,” he said. “The manuscript suggests more data are needed because
there is a paucity of research data in this area.”

He said there might be a transient buildup of lactic acid in the milk
during strenuous exercise. “That might change the taste of the milk. A
sweaty mother might have more salt in their skin so the baby would taste
it and it would differ from usual feeding.”

Meanwhile, La Leche League, an organization whose stated mission is to
promote breast-feeding worldwide, has suggested that because women feel
better when they exercise, it is good for both mothers and babies.

However, on their website, La Leche League advises that breast-feeding
moms wait until the baby is at least 6 weeks old to resume exercising,
start gradually and consume plenty of fluids. Brisk walking, mild aerobic
exercise and water exercise may be an ideal way to start, they suggest,
but don’t overdo it. Getting a doctor’s approval before beginning any
exercise routine is also advised by many experts.

More information

To learn more about breast-feeding, visit the U.S. Department of Health and Human Services.

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