Description from Knitty.com:
Here are two versions of a fun little sweater just right for spring.
Both styles feature wide ribbing and a lapped boat neck that buttons at the shoulders. They’ve got a bit of style, but are definitely ready for everyday wear, particularly when knit with an easy-care yarn.
Feel free to mix and match elements from both sweaters to design one perfect for your little one -- stripes, sleeve length and body length can be used interchangeably across patterns.
This is also a great pattern for sibling sweaters: good for girls or boys with lots of room for variation.
Note that the gauge in a cotton yarn such as Cotton-Ease expands after wearing, so the fit will be a little looser.