Last year my newborn baby was a lamb for Halloween: http://www.craftster.org/forum/index.php?topic=416047.msg4919937#msg4919937
This year I tried to up the cuteness factor even more by dressing him as the most adorable animal in the world: a fennec fox.
The outfit is made out of warm and cuddly fleece, with fake fur for the tail and the back of the ears. I used Simplicity 2506 for the jumpsuit pattern, and the hat is a modified sweet pea pilot cap (http://sewliberated.typepad.com/sew_liberated/2010/02/sweet-pea-pilot-cap-pattern-and-tutorial.html
). The tail ties on, so it can be easily removed for sitting in a stroller or car seat. If it still fits at Easter, I might torture the poor kid by re-purposing the jumpsuit for a bunny outfit!