Arm/advice

Hey everyone. I’ve noticed that I always have to adjust/bring my baby’s arm forward every time I carry her. It seems like she puts it out very stiffly. When I put her in her stroller or lay her down back first she bends her arms and forced her neck to stay up. Her arm will sometimes go straight out and I have to bend(for lack of a better word) it next to her. It doesn’t seem to bother my baby and she moves it normally. Does any other baby do this? Should I be concerned?