Hi, new to the site so sorry if I get anything wrong.
I have a Daughter who is 9 weeks old and won't sleep during the day without being constantly rocked/cuddled/pushed(in pram)/etc etc. Unsure if to let this carry on and deal with when she's a couple of months older or to nip in the bud now. Also have an older son and can't for the life of me remember what we used to do with him. However, he does and always has slept like an angel, so would be helpful if I could remember!
She screams like a banshee and has a bloody awful temper too!
Rock, swing, sway - whatever movement she likes! If all else fails, get a Nature's Nest and bounce her (I swear by ours - it's seen both of mine through their rock-to-sleep phases). Don't worry about setting up habits - she's too little to form them. A sling is good too and it really doesn't matter if she sleeps in that not in a cot. DS spent his first three months in a sling.