The pattern is roughly 6-12m it fit their little babe (about 5 months old) and Penny (12 months) although if I were to make one for Penny I would make it a little longer in the bodice and sleeves and then it would have been perfect.
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Prep the sleeves by pressing the interfacing to the elbow pads and then sew the elbow pads on the the sleeve they will be slightly towards the back side of the sleeve, and down towards the bottom. Make sure they are opposite of each other.
Then ease the sleeve into the sleeve curve of the shirt with the right sides together. Then sew in place.