Alyssa Milano is confused: Why has she been criticized for posting selfies as she breastfeeds her new baby while the world is going bonkers over Kim Kardashian's nudes?

The 41-year-old mother of two had a bouncing baby girl two months ago with husband David Bugliari. When she showed off shots of her breastfeeding Elizabella Dylan on social media she was hit with nasty comments about how disgusting it was.

After Kardashian's nude photos on Paper magazine blew up the Internet, Milano wonders: "No disrespect to Kim but ... people are offended by my breastfeeding selfies and are fine with her (amazing) booty cover?"

To underscore that she holds no ill will toward Kim and is just as amazed by the photos -- and a particular body part -- as everyone else ... she tweets: "I mean it really is ... unbelievable."

And despite the haters, Milano continues to post Instagram photos of herself giving Elizabella lunch -- even while she gets her hair and makeup done for an appearance.