I wouldn't say I was judgemental, mostly because I had never been around parents of young children. The only cousin in the family who's had babies in the recent past is one that I don't see often and she's also an infuriatingly perfect person and parent tbh so nothing to judge really. I have no friends with babies as we're all fairly young still.
So whilst I don't think I was exactly judgemental, I had a few things that I was adamant I was going to stick to as a parent, the biggest one really is no screen time. And to be honest, I have stuck to that. My son is now over a year old and he's watched tv three times in his whole life.
However, the only reason I've stuck to that is sheer stubbornness and refusal to admit defeat. I'm no longer at all convinced that a responsible amount of screen time with age-appropriate material does a child any harm whatsoever.
Actually, there was one thing that whilst I wasn't exactly judgemental, I did feel ever so pleased with myself that I was going to do, and that's breastfeeding. All my family breastfed with no real issues, so I was sure it was going to be a breeze. Haha, no. We had a bloody awful time of it and ended up combi feeding. Again, the only reason I even combi fed at all instead of just formula was sheer stubbornness. I'm not convinced it did my baby a lick of good given the circumstances (cba to go into it but just trust me, that baby did not want to breastfeed).
One that I see lots of people on here being judgemental about is dummies - I was actually pretty pro-dummy, as I'd read about how it is a protective factor against SIDS. But did my baby want a dummy? Not on your nelly. He's inherited my stubbornness, that's for sure!