Pattern #3 in book.

Sizes and center back dimensions:
S1: 0-3 months (9”)
S2: 6-9 months (10.25”)
S3: 12 months (10.625”)
S4: 2 years (11.375”)
S5: 4 years (12.25”)

Notions:
Sizes 1, 2 and 3: three buttons
Sizes 4 and 5: four buttons