"Anyone who doesn't respect, and understand what a sacred time this is, is an idiot," wrote Facebook user Chelsea Rebecca.
"I'm confused," added Heather Elms Hunt. "She is stunning. Absolutely beautiful. What could anyone [possibly] say about her?"
Fehlinger also lauded moms everywhere and had some advice for the critics.
"I say let's raise a Shirley Temple to swollen feet, stretch marks, nausea, all the extra pounds and the dark circles! They're badges of motherhood. And for those of you who think that's 'disgusting,' remember a woman went through the very same thing to bring YOU into the world," she wrote. "In the meantime, let's all remember the lesson Mom taught us – if you have nothing nice to say, say nothing at all."