Aidyn has a few things... he had a really soft teddy which had a pullstring and played a sweet lullabye - the musci box in the teddy broke after about a year, so we replaced him with a soft pullstring hippo which still goes to bed with him every night.
He also has his blankies. They are the polar fleece wraps that we used to wrap him in when he was very little. I cut them into quarters so they were small enough for him to take to bed safely, and so that there would always be spares when the others were being washed - they are still going strong!
And the last thing he has as a cuddle toy is DP's teddy from when he was a baby boy... its over 20years old, and pretty worn, but Aidyn loved it straight away... sooo sweet
Now that he is older he takes all of them to bed, but when he was very little he just had his teddy, then I let him take the blankie quarters in with him from about 8 months.