3 days no poop

why kaya yung baby ko ever since nag change kami ng interval of feeding from 2hrs ginawa kong every 3hrs eh hindi na sya everyday nagpu-poop? 2 months old na si baby.. okay lang ba ito? formula fed po sya.. btw, need ko i change interval of feeding nya kase lagi sya nagsusuka pag every 2hrs. now naman hindi nagpu poop 😩 #pleasehelp