Baby stretching back after nursing! Anyone else?!

Neska

So my 2 week old always stretches/arches her back and arms after nursing. She doesn’t cry when doing it and looks content after. However, when I googled it i got a bunch of scary stuff about it, starting from acid reflux and ending with cerebral palsy! Sometimes I hate google! :(

Does anyone’s else’s baby stretch that way, and any thoughts on why?