Totally normal! My DS went for 6 days once! But then BOOM! 3 big dirty nappies in a row. And yes his farts smell more than his poo !
The parent helpline said some BF babies can go up to 12 days . I mights seek help if DS got more than a week or so - cause he tends to get upset around the 6 day mark. The look of relief afterwards is quite adorable!
it was funny because her poo day always came around after I'd done a load of her washing so she'd end up pooing in the same suit everytime! And it was always super explosive - so it became known as her poo-suit

DS has a chair he always seem to do it in! His poo chair!
Rach xx