In shades of blue and green, this organic cotton sweatshirt for boys is by Stella McCartney Kids. With a fun farmyard theme, it features a cloud-filled sky and fluffy white sheep fenced in fields of green. This casual long-sleeved top is made mid-weight jersey, with ribbed trims and a cosy fleecy inside. The Stella McCartney fit can be quite small so choose a size up if you want room to grow.