I tied my 1st baby quilt too. Mine was only about 32"x28"....I used yarn that was colorful and fun and matched with my blanket...I threaded the yarn on one of those needles with the big eye and are like 2inches long I dont know the name of them but yeah then I just poked from the top down then up again and tied a knot...I left the tassels about 1/2" long...its still together after many many washes
best of luck...