Valerie Molstre from Minnesota shared a selfie of her breastfeeding her four-month-old son for the first time after having chemotherapy.
Molstre was diagnosed with aggressive breast cancer at 28 weeks pregnant, and she gave birth to her healthy baby boy after five cycles of chemo.
In the Facebook post, that's now been shared over 10,300 times, Molstre explained that she was initially told she couldn't breastfeed or pump after chemotherapy.
It was only through perseverance that she was able to find a lactation consultant who was willing to research her specific type of chemo and advise her.
After two and a half months of expressing milk that her son couldn't drink, Molstre's chemo cycle began to let up and allowed her to have long enough between sessions to express safe milk.
And finally, after four months of pumping six times a day, she is able to feed her son.
Molstre wrote: "We still face challenges. Radiation will likely dry up my milk on the effected side, but I feel victorious today. This was like taking the power over my body back.
"I'm the one in control of this one thing. This is something only I can do for my child, and if something happens to me, this is protection and health I can give him that will last the rest of his life."
She urged others to share her story, adding: "I wasn't able to find any information on breastfeeding with chemotherapy online.
"While every situation is different, I hope this will find some women who have been told they can't breastfeed, and encourage them to keep looking for answers.
"Find an expert, and if you have the will, you will find a way."