Tiggsy I'm having the same worries about my cats. One of them is very docile, loves being stroked and petted and when he's had enough he wanders off. On the odd occasion there's been kids around he's been exactly the same.
The other cat also loves being stroked, but when he gets bored he starts play fighting. He's very sociable with adults, but seems scared of kids (I think the height things confuses him, he's not very bright.) He tries to run away from them, but if they follow him to stroke him he's been known to swipe at them.
I'm hoping the cats will get used to the baby as it's growing up, and we'll be able to teach the LO about how to treat the cats so they don't get scratched.
Mine are both male, so I've not noticed them being more clingy (no more than normal) but over the course of my pregnancy they've discovered my bump is a very comfy place to sit.
On quite a few occasions they've been sat on my belly, purring away, and LO has started kicking. The cats haven't taken too kindly to this, and the look of disgust they've given me before stalking off to sleep somewhere less violent has been classic.