Context is essential

For many viewers the image is a touching portrait of parental care and affection. The reason that father and son were naked was because Fox had Salmonella poisoning for which he would soon after be hospitalised.

"Thomas had spent hours in the shower with him, trying to keep his fever down and letting the vomit and diarrhea rinse off of them both as it came," Whitten wrote in her post accompanying the photo.

"He was so patient and so loving and so strong with our tiny son in his lap... I stepped out and grabbed my camera and came back to snap a few images of it and, of course shared them."

But for some people the image is inappropriate at best and at worst has undertones of paedophilia. Whitten has been surprised by this reaction and was shocked when people posted negative comments about what was for her a beautiful moment.

"There is nothing sexual or exploitative about this image," she wrote in the initial post. "I was taken aback by how many people missed the story or didn't even look past the nudity to find the story."

More discussion at the BBC.