Betsyam

I am new to quilting and have just made a minky blanket with minky on both sides & warm and natural inside. It was a "flip & sew" quilt so is only quilted where the strips are joined. My questions is should I do more quilting, especially in the center section which is 7" tall? My concern is when it is washed and dried the cotton batting will shrink but the minky won't. Any thoughts before I mail this off?

Thanks, Betsy