Talk to Pediatrician on Milk Intake

My baby boy is eight months old and his current weight is 7.5kgs. He is exclusively formula fed (Meiji). Since birth his milk intake has been very low according to his age. On his Peads’s recommendation I started weaning at 4.5 months and he happily eats semisolid food. But from that time gradually he stopped taking milk and now he does not even take an ounce with bottle. I have tried every way possible but he does not take. Doc changed his milk to (olpers) but he didn’t take this one even. I add milk while preparing his food and that is the only way he consumes some quantity of milk otherwise no. I give him yogurt, seasonal fruits and vegetables purées, oats, rice and fruit cerelac, khichdi, Sabudana, semolina etc. How shall I make him drink milk ???