If your DD doesn't like the sizes you are making, ask her what size she wants, and tell her to be specific, not just wide enough for this and long enough for that, but 36 by 45 (or what ever measurement she wants it) and design a quilt that size.
Change the size of the blocks you are using, add another row, add sashing, add or subtract borders. There are a number of things you can do to change the size of a quilt, to make it any size you want.
Charts with quilt sizes are just a GUIDELINE, not set in stone, so make the quilts the size you want or need.
I think a 60 x 60 quilt for a baby or toddler is way overkill. As much as we might like the quilt to last them a lifetime, making a quilt 5 ft by 5 ft is, in my opinion too large. Besides, if you make them a small quilt for when they are born, then you can make them another larger quilt as they grow, and perhaps even get them to help with making the quilt, or at least picking out fabric for it. And that would be more special to them as they grow up.
Diane in Colorado Springs