I heard recently that it isn't good for children's hands and elbows to be spun around while holding their hands. So I never even pick up my child by the hand or forearm.

I normally pick her up by putting both my hands in her armpits and picking her up that way. However sometimes I have something in my hands and I need to pick her up with one hand. Is it ok if I pick her up using one hand grabbing her by her upper arm? Can I carry her a short distance like this without causing any damage? Is it ever ok to pick up a child like this? At what age does it start to become ok?