From Sirdar’s website
Keep little ones comfy in these vests knitted in Snuggly 2 Ply, our finest yarn weight designed especially for the smallest members of your family. Choose from either a flat collar with button-down placket or frill edge collar and peplum trim.

MEASUREMENTS
DESIGNED TO FIT AGES
Premature
Newborn
0-3; 3-6; 6-9; 9-12 Months

TO FIT CHEST
29 36 42 46 50 52 cm
11½ 14 16½ 18 19¾ 20½ inches

ACTUAL FRONT CHEST WIDTH
16:20:23:25:27:28 cm
6¼:8:9:9¾:10¾:11 inches

FULL LENGTH
19:22:25:27:30:32 cm
7½:8¾:9¾:10¾:11¾:12½ inches

SLEEVE LENGTH
for all sizes
3 cm
1¼ inches

MATERIALS
Vest with Frill Edge
Sirdar Elegant Button
Code B5611-0001
2 3 3 3 3 3 buttons

F072 Snuggly, 2ply, 50g
shade 251
1 1 1 1 1 2 balls
505, 505, 505, 505, 505, 1010 yards

Vest with Collar
Sirdar Elegant Button
Code B5611-0001
1 1 2 2 2 2 buttons

F072 Snuggly, 2ply, 50g
shade 251
1 ball for all sizes
505 yards

The yarn amounts are based on average requirements when specified tension and yarn is used.