6 day old poop question ??

My baby is 6 days old. She is formula fed. She didn't poop at all yesterday and was only having small ones the day before. She didn't poop all day today and as i was getting her ready for bed.....

💩💩

I had her diaper off bc I was changing her and she started pooping. She was having trouble. Like it hurt & pushing hard. It was a little more solid than I think it should have been. And A LOT. Like would have been a massive blowout- took 2 diapers.

Is it her formula? Do I need to change it? Or is this normal for formula fed babies?