Restless arm syndrome postpartum?

I’m 6 weeks postpartum and have always struggled with restless legs, especially during pregnancy. Lately though, I’ve been dealing with what feels like restless arms, which I didn’t even realize was a thing.

My guess is that it could be from holding my baby so much (it honestly feels like my arms have been getting a constant workout from how long and often I’m holding him). It’s that uncomfortable, hard-to-describe urge to move them.

Has anyone else experienced this postpartum? What helped you?

For reference, I do take magnesium.