Hey mama, ito talaga common sa breastfed babies, parang once a week or even less frequent ang poop nila, and it's totally normal as long as baby looks happy, gaining weight, and ang diaper wet naman regularly! But since baby is only one month old pa, I'd really suggest mentioning it sa pediatrician mo sa next check-up, just to be sure everything is okay and wala kayong worry, kasi at this age mas better maging safe than sorry.