DS is 14mths and very well developed in most areas. I'm keen to get him using a beaker / cup and to feed himself, although i'm not pushing him.
He'll drink water / diluted juice from a cup we got him, and will feed himself if we put in on the spoon/fork and hand it to him.
Out of curiosity, how old were yours when they could sit and spoon feed themselves, use a cup etc?