I have responded to these threads before(I've been off for awhile), I'm one of the ones who doesn't like to see babies at weeks of age in a crowded park. That being said I have 5 kids and have taken babies at different stages. Here is the thing--we tend to defend anything we WANT to do, wether it is the best idea or not, and we are also assuming the parents bringing the infants are sane
It's the people litterally dragging through the parks with babies, or babies in the middle of summer with no sun protection that everyone sees and comments on. If you take your little, little ones, just know their limitations and adjust for the baby, because they can't tell you how you are messing them up. We always told the older kids, if we go to Dis, we have to go with the baby in mind, if that meant dad and I split up, I went back to the room with the baby, that's what we did. My babies are now 4, so no more formula, diapers, naps----sad, but 
It's the people litterally dragging through the parks with babies, or babies in the middle of summer with no sun protection that everyone sees and comments on. If you take your little, little ones, just know their limitations and adjust for the baby, because they can't tell you how you are messing them up. We always told the older kids, if we go to Dis, we have to go with the baby in mind, if that meant dad and I split up, I went back to the room with the baby, that's what we did. My babies are now 4, so no more formula, diapers, naps----sad, but 
I was just talking about the people(and we've all seen them) running or dragging through the park with little ones. Maybe it's different for my family because we go ever year, and don't feel the pressure to see everything and get the most for our money. I've always been one to air on the side of reasonable caution. It was just an opinion, not a judgement, I have enough kids to keep covered, hydrated, fed, out of peoples way.......

