Soft stool — bowel movements that are softer than normal; not necessarily full diarrhea and can result from diet or changes in health.
旅行中に食べ過ぎて軟便になってしまった。
I developed soft stools from overeating while traveling.
赤ちゃんが軟便のときは脱水に注意し、水分をこまめに与えるべきだ。
When a baby has soft stools, watch for dehydration and give fluids frequently.
医師に相談したところ、薬の副作用で軟便が出ることがあると言われた。
When I consulted the doctor, I was told that medication side effects can cause soft stools.