My 2 year old poop came out white. it waseems watery & a chalk like white ball then a small green chalk ball. i'm wondering what it may be?

XS cheese or antacid: can sometimes cause stools to be hard balls and light colored or he may have actually swallowed a non-food item. Green color generally comes from bile, which is produced by the liver to help digestion. If his stool remains chalk colored, especially if his urine becomes very dark like tea, he should be seen by his doctor to check for liver inflammation.