Aside from that I say "thanks" and smile. I only give compliments back if I really feel like it and I only say things I really mean.
Mom since Oct'09. Wife to a loving husband. Expecting a little bean in May'12
What bugs me a little is that everyone who sees DS who also knows DH just HAS to mention how much he favors his dad! It's always "he's so cute, he looks just like his daddy!" which makes me feel a tad left out. Like, hello, those are my eyes in his face! Anyway, none of it matters a bit really.
Mara, mama to two boys born 05/2009 and 04/2011, after four miscarriages.
Katie - Married to Mike 06/02/01, Mom to Sydney Anne born 11/21/09 and Alice Maeryn & Oliver Thomas born 04/24/13
I don't think it's necessary to compliment back or rude not to do so. But if the other child has an admirable quality, why not mention it? Nice way to turn the conversation back.