How to Deal with Baby’s Green Stool?

My son is three and a half months old and has had green stool for four days. The lactase enzyme I’ve been giving him twice a day, two tablets each time, three times a day, hasn’t worked. What should I do? Please help me, I’m really worried! The current general condition: he can eat and drink normally; the onset and duration of this illness: four days.
One minute to read