From creativeknittingmagazine.com:

This blanket is made especially to accommodate the safety harness of Baby’s car seat.

Errata: Directions in magazine state 200 yards/1 skein for materials. It should have read 300 yards/2 skeins.

My bad - sorry!

Love this pattern but can’t find a copy? I have designed two other knit blankets for car seats - you can find them here on Ravelry