pretty sure it doesn't apply to birds in general *thinking emoji*
OK so I searched on the internet, and first you have to see if the baby bird has feathers or not, in this case yes, it doesn't seem to be hurt so in this scenario we shouldn't interact with this baby bird because it is natural for birds to fly but not so much to land and it appears this baby bird is learning to hunt worms or insects, waiting to develop enough muscle to fly, it is normal for birds this age to pass a lot of time on the ground.
Also, it is a myth that if you touch a baby bird, it will be abandoned by their parents since they don't have a developed sense of smell. (my bad) but you should still wear gloves in case there are parasites or transmissible sickness. (￣∇￣")
thank for searching the information!
Σ(っ°Д °;)っYou shouldn't touch a baby bird so carelessly because if the scent of a human stick to it you can say goodbye baby bird (●'◡'●)ﾉ
(it'll die because her mother won't recognize him and neglect him)