Would really like to heat any success stories or advice on this subject!
We've had a rescued cat for 4 years who has grown in confidence and is largely chilled out (asleep) but also very defensive, sudden movements make her lash out.
Our DS is becoming mobile and is very excitable towards her - I manage to keep them apart most of the time, but we're in a 1 bed flat and it is getting harder! She has managed to scratch his hand (lightly, fortunately) once, when I turned away for a split second 
We're trying to buy a larger property but for now I'm worried about keeping them apart. We have a large playpen, but DS can reach through the bars.
Family are pressuring me to rehome the cat, but I won't consider it. She's not unhappy/stressed currently so it wouldn't be best for her (should that change in future of course I'd reconsider her best interests).
Have not tried Feliway - not sure if that would be recommended?
I hope that by 2 ish (?) DS will understand to be gentle with her, stay away from paws etc, and in a bigger house their contact will be reduced, so she won't feel threatened as she'll have somewhere to escape to - too optimistic?