Murgatroyd and her fiance Maksim Chmerkovskiy welcomed son Shai Aleksander on Jan. 4.
"Real life: I took this photo 8 days post birth. I left the hospital looking 5 months pregnant. Many people think a woman should shrink right back to her pre-birth weight immediately. That is just not the truth for most," she wrote, alongside a picture of her proudly displaying her body.
She continued, "The female body is incredible and resilient, but healing and strengthening take time. Now it's time for patience and hard work. Lots of love to all the new mamas out there on the journey."
Murgatroyd, 30, also added in a hashtag that "shaiiswortheverypound."
The "Dancing" duo announced their engagement in December 2015. Six months later, they revealed they were expecting their first child, whom they welcomed earlier this month.