baby`s ideal weight at this age around 8.5kg. ur baby`s weight is 7.1kg. it is slightly lower than ideal. this may be due to that ur feeding pattern is not much correct. give him milk based diet. give him dalia, khichdi, fruits, potatto, curd it means all things which are used by u & ur family, can be given to him. increase frequency of feeding. keep busy in activities when u feed him. by this she take feed easily. u can go for stool test
in which routine microscopy, pH & reducing substance. give pre & pro biotic combination like Bifilac
1 times daily for 5 days.