Jan Andrea’s Baby Crafts is a fantastic source for baby sewing projects: carriers of all kinds including ring slings, pouches, mei tais, ring wraps and all their variations; nursing pillows, sleep sacks, crib sheets, diaper bags, and chair covers. There are also instructions for converting regular sewing patterns into maternity patterns and altering regular bras and T-shirts into nursing wear. Her own patterns are free and shared under a Creative Commons Attribution-NonCommercial-ShareAlike license. She also provides plenty of links to other people’s patterns around the web.
(both images from Jan Andrea’s Baby Crafts website)