First let me congratulate you on becoming a mother to a skin baby.
LOL
The proper thing to do is put on the invitation the store or stores where you are registered.
When you register at whatever stores you wish they will have all the items
you choose in their data bank and when someone comes in they can pick out whatever they want from that list. It would not be proper to list items on an invitation. Good luck to you and have fun at your shower.