AAAHH!! Sooo true! I have a friend who works with small children, but has none of her own, and she is constantly talking/judging other people's parenting choices. She has read a lot of books about child development, etc, but doesn't seem to understand that what works for one baby does NOT necessarily work for another! It's so annoying. That and she is really unrealistic about how "perfect" parents should be. You will not be perfect and, like another poster said, when your 11 month old baby is throwing a fit in a restaurant, you might just change your mind about "[insert baby blog] says no bites of [insert evil food type] til 1 year!"
This woman made me feel like the world's worst mom because I gave my son some diluted juice when he was 9 months old! She also warned me that while I'm pregnant, I'm not allowed to pump gas. OK well I guess that's fine if I happen to be driving with my husband at all times, but it's just not going to happen every time!
I finally decided I didn't care and that when she does have kids (she wants them someday) she will understand! I just nod and smile, and will continue to nod and smile when she calls me in the middle of the night in a panic in 5 years because her baby won't sleep perfectly through the night in a crib by 4 months!