DS is 4 months old.
Stepmother can make thinly veiled digs. Yesterday she commented DS was really small, he's not, he's on the 75th centile.
She kept saying it, I was sleep deprived and fed up with her behaviour this Christmas. I replied that maybe it's in comparison to her year old grandson (who's she's just seen and is a very large child). She snapped back that so and so's baby is the same age as mine and is a lot bigger, I pointed out that's likely because she's bottle fed....
Aibu to think she was being rude?