A few that I've come across:
"I love the way your DS is happy sitting in the buggy. My DS is never happy just sitting there like that, he is so grown up and needs constant stimulation or he gets bored"
"Oh DS, look at that slop that Pixiegirl's DS is eating, you're wondering what it is because you only have big boy food don't you?"
"To be honest I'd much rather have a child who's more average, like your DS. I think being so advanced is going to bring my DS nothing but problems when he gets to school"
All said by a "friend" who is lovely in many ways but also very competitive and our meet ups are frequently spent with her reeling off a list of what her DS is now doing, or by her making out that there's a problem because she thinks he's doing things so early....
What competitive parenting comments have you all come across?