Bottle refusal

Dear Moms

My son is 4 and half month, he is on 90 percent breast milk and 10 percent on formula. I joined work when he was 2 months, from tht tym he was on mixed feed bottle as well as bf. Suddenly my son is not ready to take bottle. My in laws are taking care of him while I m working. It’s has become hard task for thm to feed him. He is ready to starve himself but won’t take milk. Now his weight is not gaining and I hv low milk supply too.

Pls help me how to train him for bottle feed.

I hv tried all types of bottle

Tried giving him warm milk

Nothing worked

Hardly he is taking 40 ml milk when I m in office