When you look at etsy, be sure to see how many have sold. There is an artist or two on there with several quilts listed for thousands of dollars each. But if you look closely, you see that she hasn't actually SOLD any. Sometimes that is a marketing ploy. If I post a baby quilt for $500, a shopper will be surprised and interested to see what I sell that is worth $500. I might have 3 other baby quilts listed for $100, which will suddenly seem very reasonable.
$100 is very reasonable for a nice baby quilt.