You should have no problem doing these in time. I would break down the steps into 25 or 20 minute chucks of work and work a little on them each day. I loved making my little granddaughter's christining gown a while back. It was quite plain but I loved working with my twin needle. See it here.
http://quilt-knit-run-sew.blogspot.c.../08/dress.html
Best of luck and enjoy those babies.