Diarrhea from formula?

Jay

My LO has been on ready to feed since about 4 weeks because powder made him gassy. Doctor said he should be good with powder now, especially since we do give it to him every once in awhile with no issues. So 2 days ago, we switched to powder only. He hasn’t been fussy or gassy (actually sleeping much better) but has had diarrhea all day today. Is this common? Anyone else experience this?