The pattern is pictured on the front of the First Things First booklets. It is Pattern 2, with the instructions on Page 6. In The Baby Knitting & Crochet Book, the picture is on Page 20, and the pattern on Page 21. In Holiday Baby 3 Ply, it is pattern 12.

Back and front worked in one piece to armholes.

Measurements
To fit chest sizes
40, 45, 50 cm (16, 18, 20 in)
Finished measurement
44, 49, 54 cm (17½, 19½, 21½ in)
Length to shoulder
26, 30, 35 cm (10¼, 11¾, 13¾ in)
Sleeve seam
12, 14, 16 cm (4¾, 5½, 6¼ in)

Each booklet has its own recommended choice of yarns. The following is from The Baby Knitting and Crochet Book

Materials
Peter Pan Darling 3 Ply
3, 4, 4 X 20 gram balls
5 buttons
Baby ribbon
Shirring elastic if required.