My baby was quite similar to this. Wrapping helped a little bit, but she still needed to suck to settle. A hammock helped a little too, but I actually had to wrap her, then bounce her, pop her in the hammock, and then rock the hammock. The sling was the real winner. So most of her sleeps were in there for her first 4 months, even in the mental Brissie heat. She's now a great sleeper, she goes right through the night and has two good day naps in her cot, so don't fret too much about "habits"