HB, it's the same at our mother's group. It drives me nuts. The comparison doesn't stop with the firstborns either. Most of us are onto our second and they are still comparing. WIth DS, I got into weighing him weekly because he started off gaining very little weight, very slowly so I was always paranoid. With DD, she has only been weighed at her CHN appointments. There were a couple of weeks at the 4-5 month where I weighed her weekly because she did stop gaining weight for a bit there. But now she is back on track and probably won't be weighed until her next CHN appointment next month. I know she is growing now because her clothes are becoming smaller on her!