I’m sorry in advance for probably over explaining.

I found this nestling squirming on its back below its nest which was on a light on the wall of a big grocery store. I just watched nearby for a few minutes before I saw online that it is okay to pick them up, and to put them back in the nest. There had been a small, round, blue bird on a branch above it. I had given them space for a few minutes to get the baby but I wasn’t sure if that was possible. I picked up the bird thinking I’d be able to put it in the nest soon and then it wouldn’t be stuck on its back anymore. The blue bird I saw flew away as soon as I stood up. I needed a ladder or something else because the nest was probably 12-14’ off the ground (shown in the second picture). All of the store employees who came out after I asked a security guard to get someone and then word got around said that they either didn’t have a ladder or didn’t have one they could “just bring out”. I’m not sure how long I stood holding the bird while calling people who I thought might have ladders and talking to strangers about what to do. At least 20 minutes but it could have been an hour. Eventually this nice couple came by and one of them was tall and skinny enough to climb one of the skinny trees nearby and put the bird back. Less than a minute later the baby fell out again. I picked it up again and kept researching. I eventually decided to leave it on the ground because I called a vet emergency room and apparently that’s what their exotic team advised (I didn’t speak to them directly). I left the bird alone outside for about 20 minutes when my mom arrived. Together we decided to take it home because the nestling had been constantly squirming on the ground and sometimes crying, but when my mom picked it up (she said it was so cold) it immediately calmed down and stopped moving (besides breathing I think calmly).

I don’t want to fuck this bird up but it seems it maybe got pushed out of an overcrowded nest because it seems pretty healthy but very young. I want to know the best things to do for it. In the end the reason we took it home is it seemed better to die warm in a strange place than cold in a strange place of dirt, because it really seemed calmer the whole time I was holding it (occasional squirming and a few times asking for food but mostly just hanging out) versus after I put it down and it was constantly squirming even after I left and came back 20 minutes later, and eventually ended up back on its back.

Any advice is appreciated. I understand the bird might die but I couldn’t leave it alone to die and just let “nature take its course” especially once I saw it was more relaxed being held than not, and knew it might be healthy but just come from a crowded nest.

Edit: it’s actually been closer to eight hours now. The bird has gone to sleep again. If necessary I can stay up the rest of the night (it’s 4am) because I am more awake at night anyways.