I Love Buttons - Just Not Sewing Them On

I finished this cardigan 2 weeks ago...it took me that long to put on the button band backing and 5 little buttons.  It's the Playful Stripes Cardigan by Alana Dakos - I love how this looks and hope to gift it to my great niece on Thanksgiving.  I just don't know if it will be too small for her or not...