First thing is hydration give ors.coconut water 2nd any. Preprobiotics for 3 days 3rd syp zn 5ml once a day for 14 days

Stop breastfeeding and bottle feeds if given and give just 2 top milk feeds using a glass and 4 solid meals a day including curds and bananas in the diet in addition to whatever you prepare at home. Give ors after every loose motion if watery and add enterogermina vials one vial twice a day for 5 days. If not improving OR accompanied by other symptoms like vomiting or dullness and refusal to feed consult your paediatrician asap.