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Thousands of women responded to the model on social media, praising her decision.

\"You look incredible! Thank you for doing your part to normalize feeding our children,\" one user wrote.

Model and actress Brooklyn Decker, who has also appeared in the Sports Illustrated Swimsuit issue, showed her support for Martin on Twitter.

Hell to the yes. ???? https://t.co/PSYtLQ8wfP

— Brooklyn Decker (@BrooklynDecker) July 17, 2018

Many others responded on Instagram with words like \"inspiring,\" \"amazing\" and \"bravo.\"

so so proud of Mara Martin for breastfeeding her baby while walking the swimsuit runway for sports illustrated ???? #normalizebreastfeeding

— Kay (@kaymoffett21) July 17, 2018

GIRL POWER! ???? #SISwimSearch Sweet 16 finalist Mara walks the runway while breastfeeding her five-month-old baby. @paraisofashionfair

A post shared by Sports Illustrated Swimsuit (@si_swimsuit) on Jul 15, 2018 at 7:38pm PDT

But with the words of affirmation also came some backlash and negative comments.

\"Displays of no values, no morality and no privacy will always be a better headline,\" one Twitter user wrote.

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