All well fed babies will pass yellow stools with little pellets like or particles like. This is normal. Frequent passing of stools mixed with urine is also normal.
As long as baby is not irritable, feeding well and sleeping well and no blood in stools.
Next Steps
Did u start any other feed recently? was the formula feeds started recently??
Health Tips
please try to prevent rash in this area because of constant cleaning.. you can apply coconut oil .. best home remedy