4 month old passing loose stool. Weight?

My son is 4 month old, he is passing loose stool from past 20 days, he pass 3 to 4 times in 24 hours. He is exclusively breast fed, he is active as usual, drinking milk without refusing and no fever symptoms .His motion is yellow to green in colour, watery and with mucus.we consulted doc she preiscribed econorm sachet pinch of it with milk every 3 hours for 3 days and asked me to stop dairy food , I have stopped it . But it dint subside. On day 7 we consulted other doctor he changed econorm with sorlac banana sachet and z&d drops, still not improvement this time . We did stool substance test attached below doctor she asked me to continue econorm (as it is more safest then sorlac) additionally TAXIMO O 0.6 ml twice a day, it’s been 4 days we started taximo but still he pass 3 to 4 times stool, watery with muscus. It is 20th day today still the same condition .What can I do to subside? How long I can give econorm? He is not putting weight? Birth Wat is 3.2 kg now 6.4kg is good weight?