Step 13: 12. Hem the sleeves
Measure the opening of the sleeve and cut elastic about this length. Feed this through with a safety pin until it can be pulled through the other side. Overlap the ends by about ½”, check you’re happy with this and it won’t be too tight for your little one’s arm. Sew the two ends of the elastic together.
Sew the opening of the casing closed and repeat for the other sleeve.