yellowish poop?

DS has been on whole milk for about 2 weeks now and his poop is yellowish, is that normal? Also he no longer gets constipated with whole milk, he used to be on similac sensative and would get horribly constipated and bleed every time he would have a bowel movement! I'm glad that's over, anyone know why the sudden constipation change?

DD has been on whole milk a month now and has yellow stools as well. They are also for the majority really big hard ones, poor kid.