Eh normal jer tu mama, especially if baby fully breastfed! Yellow bright colour like that is actually the sign of healthy breastfed poop, a few of my mum friends were also worried at first but the paediatrician assured us it's perfectly fine sebab milk digestion la. Long as baby is gaining weight, wet diapers okay, and dia active ja, don't worry lah! Tapi kalau you're anxious or notice any changes like frequency yang drastik or ada mucus/blood, better check with your doctor just to be sure and put your mind at ease. First baby memang banyak question hehe, completely normal!