New mum Kat Von D has revealed the great lengths she took to source breast milk for her newborn son, Leafar Von D Reyes.

In a candid Instagram post, the makeup mogul admitted that she struggled to breastfeed her first child in the days following his birth last month. So with the advice of a pediatrician, she asked a stranger to donate breast milk while Von D, 36, waited for her supply to kick in.

"During the first two days of Leafar's life, his blood sugar count had been low, and as much as I had committed myself to strictly breastfeed, my milk hadn't come in yet," she explained alongside a video on herself breastfeeding. "The pediatrician suggested asking around to see if any friends might have a bit of extra milk they could donate -- and if not, I'd have to consider supplementing with formula -- something we personally did not want to do."

As luck would have it, Von D's midwife, Sara Howard, knew a woman who wanted to help.

"Without even knowing me, and without question, [she] stepped up and donated a few ounces to us in the middle of the night," wrote Von D. "Needless to say, Leafar's levels boosted, and we are now happily breastfeeding at home.

"This is true community. True sisterhood. True kindness," she added. "And I can't wait to pay it forward one day soon."

But her unconventional move has raised eyebrows with some of her followers, sparking Von D to update her post.

"I'm not shaming anyone who chooses to use formula. Just like I would never shame anyone for the food they ate or anything for that matter. So, please don't shame me for my personal approach to nursing," she wrote.