Hi po! My 2-year and 8 month old kid is having watery/soft stools na po for 1 week now but no fever.

Hi po! My 2-year and 8 month old kid is having watery/soft stools na po for 1 week now but no fever. Do I need to bring him to the doctor na po ba kahit wala naman lagnat at di naman nanghihina? Hindi rin po nagsusuka at wala naman po syang nararamdaman na sakit nang tyan. A week ago po, sunod sunod yung kain nya nang grapes at watermelon kahit hindi pa nakakakain nang rice. Please help po kung ano ang dapat gawin para maging sticky ulit yung poopoo ni baby. Thank you so much po.