Stretchy wraps can be very useful in those first days, weeks and months of life with a newborn, the main reason being you can tie it on, and leave it on, for as long as you want or need.
Wrap it, tie it, and you can pop baby in and take baby out, without retying or readjusting. In that initial period after your baby is born (known as the 4th trimester), this can be wonderful - you know where the sling is, you know it's on and you know that baby is close, secure and connected whilst snuggled in there.
Adjusting as a family and adapting to the changes that a newborn baby presents can be challenging. A stretchy wrap (or indeed any sling really) can make this transition simpler - babies are calmed when they're next