11wk old not pooping

Ja

Is it normal for 11wk old to poop once every couple of days? I breastfeed throughout the day and supplement a bottle of formula (4oz) before bed or if I’m out and about I’ll give him to-go formula. He used to poop like 1-2 times a day but the past two weeks he’s pooped (has a blowout) every other day or 2 days. Advice?!