How many times do you was your flannel before you sew it together? I am making a baby blanket with cotton on the front and flannel on the back. I have only soaked it in water and dryed it once. I am making a whole piece blanket. But when I layed it out to baste it with the spray it seemed to stretch like. So do you think I should have washed it a couple of times before making my blanket or do you think it will be alright?