Hello, I'm 24 weeks pg with DS2 and have a sudden and acute desire to knit him a baby blanket 
I want it to be a decent size and striped in various colours.
I have knitted before but not for years - can't remember how to cast on but am sure YouTube will have some helpful vids.
So - any advice on:
Best size needles for a nice density?
Will I need a circular needle?
Best wool that will be gorgeously soft but also machine washable?
What's the ideal number of stitches for a good sized blanket?
Any other advice at all?
Am really looking forward to choosing some gorgeous colours.
Thanks!