<Steps up on soapbox>
what is confusing people unfortunately is that they have associated breasts with sex so much that they forgot the REAL reason humans and all mammals have MAMMARY glands!! I agree on both points that Brit is skeezy in general AND unoriginal in the pose, but I see nothing wrong with the baby nursing on a PARENTING magazine. Now if it was a big hairy (fill in the blank with your preferred term) suckling on the breast, then it WOULD be sexual and inappropriate.
I attempted to breast feed my son 25 years ago. I say attempted because he was born c-section, we both had infections and he was started on a bottle before my milk came in and I wasn't offered a breast pump to start my milk right away. By the time I got to start trying, he was hooked on the bottle, there were no lactation coaches like today and I didn't produce enough milk to keep him happy and well fed.
I think the baby in that photo looks happy and healthy, and there is nothing wrong with the photo. I have no problem with women who breast feed in public either regardless if they cover themselves and babies or not. I think it's offensive that people think women and babies should have to go to the filthy ladies room to feed. They wouldn't eat in the bathroom so why should an infant?
<Steps down from soapbox>