Development milestones

I know that baby knows his name already because he will turn to look at you when he sees you calling him.

Another thing he should know by now is the word "no". Becoz sometimes when u say no..
*he'll stop wad he's doing and look @ you... But he will still want to test limits.

This is what I researched on the babycentre website:

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Developmental milestones: Understanding words, behavior, and concepts

8 to 12 months
Your baby's beginning to understand simple requests. Say "no" when he tries to touch an electrical outlet, for example, and he'll pause and look at your face — maybe even shake his head "no" in return.

He's also testing your responses to his behavior. He'll throw food on the floor just to see what you'll do, and then file your response in his memory bank. Later he'll test the waters again to see whether you react the same way.
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Isn't it interesting? It is as if God made a checklist for babies to follow and that they will do certain things before reaching another milestone. hahaha

Anyway it is usually just a rough guide as to what baby will or will not do yet.:)