Baby dislikes freshly pumped breastmilk

When I get my son a bottle of freshly pumped breastmilk like when it is still warm he refuses to take it. He used to take a bottle when he was a newborn but now he’s 11 months old. He has tried multiple kinds of bottles and nipples and flows and he refuses them all and when I squirt milk into his mouth he gags and acts like it’s disgusting. He nurses just fine. So I know that nothing changes from my milk from the boob to the bottle because I freshly pumped it. But he just acts like he’s going to vomit when I give it to him in a bottle