I think his concern was, first, medically out-of-date. I trust the woman and her husband were able to weigh up the risks and benefits, and judge for themselves that this was medically appropriate in her situation. Nowadays multiple C-sections are considered high-risk, yes, but not reckless, and are much less hazardous than they were even 25 years ago.
Second, Pope Francis' way of expressing himself was too brusque, perhaps because he was worried for her sake, by what he perceived to be her risks.
But it was not, in my view, "detraction" motivated by a desire to degrade this woman in public. He was worried about her. And he tends to blurt out his reactions unfiltered. I'll bet the woman has forgiven him. I would.
Well, until you, or Pope Francis, receives her/his medical degree, I recommend you hold you medical advice to yourselves.
Why not congratulate the pregnant mother and offer your prayers for both Mom and baby, rather than accuse her of "tempting God"?
And I noticed you have no comment about Francis' comments on the Zika virus and the possible justification of artificial birth control.
Whatever, your "grip" is on; it's not Catholic.