I have a one year old with very soft loose looking pale yellow/pale green stool with some occasional undigested food. Yesterday it was darker but had undigested blueberry bits. Today it was paler, more with a yellow tinge and one stool had undigested cher

Fast transit. I year old have fairly fast transit of foods through the digestive tract. Its not surprising that there is undigested fibrous foods like blueberry and cherry. Probably better to puree these fruits for better digestibility and absorption as well as decreasing the risk of choking in this age group.