I remember with both Odessa and Sophie (there was another one too???) They started going longer in between at close to a month. I know that by 4 months Odessa was going over a week in between. She would have a blow out when she went, but I was told not to worry about it. We started solids with her at close to 6 months and then she went back to once or twice a day.
Totally normal. Babies don't poop on any kind of 24 hr time clock. M just went a couple days without pooping, not sure how long because we don't super pay attention. It was funny though because no sooner did DH mention it than M totally exploded. I laughed so hard! Luckily we cloth diaper because blow-outs are much more rare with cloth.