The last few baby quilts that I have made I have been using the silk/bamboo batting. Cool in the summer, warm in the winter and hypoallergenic. The moms have said that they are super soft, fluff out when washed and just plain cuddly. For the baby size, I am really willing to pay the extra.
If I can find silk/bamboo I'll definitely give that a try. It sounds great. I really like a soft, cuddly baby quilt.