Hi Vicky,
Have you registered as a small batch manufacturer? Do that first. Then go through the supplies you use. Are they exempt materials? Cotton, polyester, nylon, elastic, ribbon and many others are exempt.
Your diaper cakes themselves are for mom so don't worry about anything that is holding them together. The individual baby items within them are already marketed for children so you should be good there.
If you are using snaps on your bibs you will want to go to your supplier and get their certification that their products have been tested. They are not required, but many of them have the products tested. If they don't, then find a new supplier.
Now take a breath!
Labels will be the next thing on your list. For sure your bibs will need labels and your hats.