Talk to Pediatrician on Weight Issue

Asalamu alikum, mera baby boy hy oski age 7 months hy . Mene jab se osey semi solid start kiya hy oski poop solid nahi hy . Din me 3 se 4 bar poop karta hy fluid type ki birth weight 3.8 kg tha and now he is 7.3 .he is not gaining weight or 3 din se watery poop bhi karaha hy . Me osey mother feed karati hun and fluid intake bhi sahi hy. Khany mein me osey khichri , watery sabot dana , banana, suji and daliya deti hun but osky na hi poop thik horhi hy na hi weight barh rha hy mene bht doctor ko dikha diya but mera baby healthy nahi horha plz tell me what should I do?