Growing is adjustable from 42" - 57".
Newborn is adjustable from 28" - 42".
I absolutely LOVE this blanket!! Only thing is be sure to purchase leg straps for it. I let my filly outside on a windy day with it on, came back a couple hours later and the back of the blanket was over her head, found some leg straps and never had another issue. It's actually quite warm for just 180g filling. I Highly recommend this blanket!