Hello: Nothing is technically wrong with your sentences, but your passage would read better as: "How are celebrity moms able to look so good just a few months after childbirth? '" I dropped the "there is something really incredible" which should be avoided in writing, even for the most lightweight articles: if you can get rid of a string of words in a sentence and not lose any meaning, you should always cut, cut, cut. I eliminated the juxtaposition of "luck" and "unlucky" and replaced "looking" with "flipping" for some variety in the last sentence (because "look" is also in the previous sentence).
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