In the video, the 'mom' is portrayed as a mindless, insecure fashionista who's chosen to wear her baby not because she's convinced it's the best thing for her baby and herself but, because she will be perceived as an in mom, inspite of the unnecesary (and probably harmful) pain it will inflict on her. And the coup de grace - Motrin is saying by implication, you go girl!
That's my take anyway.
Search 'Motrin' on YouTube for the video in question.