Have you ever used the swaddleme blanket in the carseat? I was wondering what the slit in the back was for and discovered it is to put the buckle of a carseat or swing through. Basically you lay the blanket down, then buckle baby into seat, then wrap the Velcro parts.

Have you done this? Is it actually safe? Would definitely make it impossible to take the baby out of the seat without waking her.