If there is a warning to stay inside we do.. Same issue of little ones that are just learning to regulate temperature as well as breathing issues. Two of my gang had issues this winter and ended up on puffers. The one that had pneumonia has been especially sensitive to humidity setting off his need to use the inhalers.

At the same time because my gang is young there are plenty of physical things we can do inside so no issues that way. We are used to being active inside where they are on a flat surface as compared to outside. I still have one that is not walking. Although outside they mostly head for the sandbox it is still not easy to breathe for them when it is too hot. Parents are totally ok with them not going outside to play and are taking them out sometimes after supper for a bit of play.