Is my 2 month old constipated?

mommamia • • B O Y - M O M M Y•

My 9 week old hasn’t poop since Monday. The last 2-3 times he poop it was more like peanut butter. Does that mean his constipated now or is it just his body changing? He’s formula fed and everything I’m finding online only takes about breastfed babies. Any tips?