Diaper poop

Hi mummies! My 3wk old newborn on formula milk hasn't poop for 2days so far. Is this a concern? Howany times in a day does a newborn on formula milk has to poop? I have stop breastfeeding for him recently due to engorged. Now he doesn't know how to latch again hence he is fully on formula. I'm a lil bit upset as it has affected him Abit. He seems bloated at times we had to play ard with 60/90ml cause we couldn't figure out of he is hungry or gassy at times.