I need to ask few more questions before answering your query. Early consultations can prevent complications. Kindly contact me on whatsapp chat  (84960595 six five) Dr Faisal Zoheb MBBS , MD PAEDIATRICS , PGPN (BOSTON), Neonatology fellow ( Newborn and vaccination specialist )

It's okay. At this age, children find more interest in exploring their surroundings, than eating. However, you have to add complimentary feeds now. If he only breastfeeds, he will develop iron deficiency. You can give him mashed potatoes, khichdi, mashed veggies, chicken stew, etc. if he doesn't like banana. Make foods interesting by adding little spices and salt. Don't give bland food. Can give Cerelac/ NAN 2/ dexolac 2, etc. at this age for boosting. You have to take patience in feeding him and it will take time

Yes at this age they prefer more playing than eating because now they can crawl and explore the surroundings more that's they loose intrest in food That's ok it's normal only