Starting milk problems

B

Ok so we introduced our little one to milk a couple days ago(he’s 11 1/2 months) and now his poops look like this. Yesterday he was constipated so I gave him water, did some bicycles, & massaged his tummy. He let it all out a few minutes later. This is what it looked like twice last night and once today. The picture makes it look bright yellow but it’s more of a pastel yellow kinda whitish in some parts. Yesterday t was mushy but today it looked more watery. Is this just diarrhea or regular after starting milk? It was 2% if that helps. I’m only used to ebf poops and we’ve had a few peanut butter poops lol since he started solids at 8 mo. Thanks for any help in advance. ❤️❤️