Talk to Pediatric Gastroenterologist on Poor Weight Gain

My baby girl is turning almost 5 months. And her weight is 5.8 she was born weight was 3.75 kg. We gave her Morinaga BF 1 Which caused constipation ( passing stool after 1 day or sometimes daily but it started turning very hard like pebbles) and she had reflux and colic issue also. After that dr advised similac Total resulted in watery stools (totally like liquid) green in her weight gain was we changed it to Similac isomil..... We changed her the new doctor advised to stop similac isomil and to start similac total comfort again. We have been using simialc total comfort since 12 weeks now. Her reflux issue is better. She had no colic for so many weeks. But he stomach issues have started again. Her stool frequency is changing. Stool is extremely smelly. She passes alot of air( flatulence )... doctor has said it is because of puts everything in her mouths which causes upset stomach. She w