According to my paed, it's normal to poo three times a day or once every three days. As long as the poo is not hard like pellets but soft like playdough, everything is fine.
Maybe butternut pumpkin makes your baby "go" more often. Eva doesn't really poo often when on pumpkin and other veg, but if I give her plums, pears or peaches at every meal, she'll poo at least three times a day! :P