I love working with minkee! It stretches a lot in one direction and not much in the other. What I do is use the 505 basting spray and it stays put. If you are worried about the spray being in a baby quilt, then wash it afterwards.
If you are using just two big pieces and sewing them right sides together, then turning, I would then use a pretty decorative stitch - like a small heart of flower, and tack it down in several places just so it holds it shape.