I do - he’s 13 now and has been this way his entire life. Born at 39 weeks (induced, but had been dilated at 5cm for 3 weeks prior), 9lbs 9 oz and, no exaggeration, STTN from day one. At the 2 week appt, I was “talked to” because I didn’t wake him up in the middle of the night for a bottle, I ignored them because he had no weight loss and would wake if he was actually hungry. He was 100% formula, so I knew exactly how much he was consuming.
He did have reflux, which was fixed with an “added rice” (thicker) formula.
He was never on a strict schedule and ate/napped within ranges of time. We didn’t cater our schedule around his and went out when we needed/wanted during the day and he napped in the stroller or car seat. We also didn’t keep the house completely silent during nap time - we didn’t purposely make noise, but he slept within hearing distance of a tv or while I was doing dishes.
My husband and I are both pretty easy going and tend to think big picture, so didn’t sweat the small stuff (generally speaking, I wasn’t a fan of people always trying to touch him). As I mentioned, he’s 13 now and has never had a temper tantrum. He’s been upset about things, of course, but never has had a tantrum/screaming/tears/lying on the ground sort of thing.
I think most of it was luck/nature that this is his personality and a little bit may be nurture. I’ve joked that I paid my dues during the pregnancy (awful), so had an easy baby and/or was given what I could handle.
