It shows the 33-year-old nursing her daughter Vivian as she gets her nails, makeup, and hair done by three different people.
The caption reads, "What would I do without this beauty squad after the 15 hours flying and only 3 hours of sleep #multitasking #gettingready."
Some moms say they would prefer Bundchen kept her opinions to herself.
"I think breastfeeding is a very personal thing," Denise Albert said. "And for her to put this on Instagram while she's getting her hair and makeup done is a little outrageous; and I think, obnoxious."
But others like the message she's sending out.
One person said that it "looks like the most regular thing in the world. Sweet."
The supermodel has said in the past she thinks there should be a worldwide law for mothers to breastfeed their babies for six months.