My DD (4mo) currently sleeps in a long sleeved vest, sleepsuit and 2.5 tog sleeping bag, she sleeps well enough but can take a while to drop off.
During the day she falls asleep within minutes when we go for a walk with her in a pramsuit in the carrycot of her pram. I don't think it's the motion of the pram as when it was warmer and she didn't have the pramsuit on she wouldn't always fall asleep.
So, is there anything suitable for overnight sleeping that would feel similar to her pramsuit as she's obviously very cosy and comfy in it?