Pattern is easily adaptable for a blanket for a preemie to an adult. Note that using a different weight yarn (e.g. a baby weight) will require a different size hook.

Blanket is square.

From the web site: </br>

Adult sized arghan is approximately 40” x 60” But you can make it any size you wish by adding more or fewer rows.

This is my own adapted version of the popular pattern that I made up for my eldest sons graduation.