My lil one is year old and I want to introduce cow milk.... Shall I use bottle for it.... Making him drink with glass is difficult.

Hello, Yes, why not? You can of course use bottle. He is just one year old and why not give him the comfort of using bottle if he is finding it difficult to hold the glass. After all bottles are made for kids. If we start thinking of our convenience as the primary thing then we would be like dictators in their lives than their parents. I think that if he is finding it convenient to drink milk with the bottle, start bottle for him. Later on, when he is 2 or 3, you can shift to glass. By that time he will have grip in his hands and it will be easy for him and you to make a shift to glass.