Re: How much should the baby move??
Every baby is different. But I think I've read somewhere to do "kick counts"-or any movement counts as I call them. For an hour keep track of how many times you feel baby move. I think it should be atleast 10. Also, I'm not sure how big baby is at 20 weeks, I forgot, it's been awhile...but I'm sure that as baby gets bigger, you'll notice more movement that you do now.
Hope this helps.