I just cringe when I see a child over the age of 12 months drinking from a bottle.
There are so many reasons that it is wrong for a child over 12 months to be drinking from a bottle. For one it can delay a child's speech, it has to do with how the tongue comes around the nipple of the bottle in order to suck from it. This cause the child not to know how to place there tongue flat in order to produce certain sounds.
Another reason it is bad is because it can interfere with how the child's teeth come in, especially if the child is going to bed with the bottle.