What is breastfed baby poo supposed to look like? Colour.... consistency. ... frequency?

DS2 pooed while I was changing his bum and it was kinda bubbly?? Not foamy. It was a bit of a farty/pooey explosion lol. Is this a sign he's not getting enough hindmilk? Or did he just airate his poo by farting?

Oh the glamour that is my life.