16 months old baby

Question: hi.. My son is now 16 months old..his weight is 0 9kg. he is not gaining proper weight.. he has loose motion..always poop 3 to 4 times a day..nd d poop is mucusy sometimes..doctor said it's not a problem.. how to gain weight for my baby?? Pls help

1 Answers
Question
Answer: eat him mashed banaña. juice fruits soups mashed milk and roti.