Talk to Pediatrician on My Infant Does Not Eat Anything

My son is 1.5 years old. In the morning, we give him Cerelac. In the evening, we give him semolina (suji) kheer or sometimes mashed rice like khichri. Other than this, he does not eat anything. He refuses roti, egg, chicken, and pushes everything out of his mouth. Nowadays, he is even eating suji and Cerelac with great difficulty. He cries a lot and does not eat willingly; we have to force-feed him. Why is this happening? Is this normal at his age? What could be the possible reasons for his poor appetite? What should we do to improve his eating habits? Does he need any tests or supplements?