Baby looks NOTHING like us

And people are making jokes that she could be the “milk mans” baby. My husband and I both have dark brown hair, and dark brown eyes, and olive skin tone. Our two year old son has light brown hair and dark brown eyes, but our daughter, she has blonde hair, bright blue eyes, and fair pink skin. Both of mine and my husbands parents have blonde hair and blue eyes so I know that’s where she gets it, I just don’t know what to say to these comments, and even my husband has asked if she is his before because she looks so out of place in our little family. I want to laugh off the comments but they are getting so annoying.