My kid is 1 year and 5 months old, weighing 8.48 kgs and lean in nature. He passes stool mostly after he eats his food .... He also likes to eat a lot but no weight gain .... We took a stool test and stool culture and montex test, but everything seems to be normal as adviced by a pediatrician .... the doctor adviced to stop giving milk, because the lactose might create this effect of immediate stool passing after a meal. So we have stopped it now for the past 2 days, but still he is under the same stage ....