Crochet sandwich - apparently this is from a book. The link Ive added goes to an adapted pattern: Adapted from Yummi Gurumi: Over 60 Gourmet Crochet Treats to Make by Christen Haden, published by Mariarosa Sala/Andrews McMeel.
Diaper cover - Repeat Crafter Me: Crochet Bunny Hat Pattern. Free pattern for this hat and diaper cover in newborn to adult sizes (for the hat. you'll have to figure out adult sized diaper covers yo own damned self!