Easy knit design for young ones

Buttons at the top of both shoulders make it a breeze to pull over head
Sizes 4ply: 0-3mths, 3-6mths
Sizes 8ply: 6-12mths, 18- 30mths
Yarn required: 2 (3:4:5) 50gm balls or 100, 150, 200, 250gms
Needles: 4ply knitted on 3.25mm, 8ply knitted on 4mm