My son will be 9 mo next week and he is refusing to take a bottle. His doctor suggested trying to give him formula from a sippie cup, but he will not take it either. It is like he hates the formula or something. Yesterday he only had 10 ounces all day and this morning only took one. I don't know what to do bc at this age the formula is suppose to be so important. Any suggestions?

He is teething right now.....
He used to take a bottle at 7, 11, 3, and 7 and eat at 8, 12, and 5 but now he is refusing EVERY bottle.....
Please help!!!