Make the rattle
Maybe, like me, you've learned the hard way you can't just stick a jingle bell inside of a plush toy. The stuffing compressed around it muffles the bell. My next thought was to stick it inside a plastic container to allow some air around it, but, to my surprise, the jingle bell rolling around inside the plastic egg became a muffled bell, and you could hardly hear the jingle of the bell.
|a jingle bell rattle|
|a bean rattle|
Inserting it in the toy
First wrap the rattle in a little batting. You can secure the batting around the egg with a little glue, or by whipstitch around it. Stick the rattle in the fullest part of the toy, and be sure that you put stuffing around it on all sides. This helps it get lost inside instead of feeling like a hard lump.
Those are my tips. How do you make a rattle?