Sport weight is Craft Yarn Council weight 2 (fine), sitting between fingering and DK; in Australia it is called 5 ply. It knits at 23–26 stitches per 10 cm on 3.25–3.75 mm needles and crochets on 3.5–4.5 mm hooks. It is light enough for baby clothes and summer tops but has more body than fingering, as with YarnArt Jeans (55% cotton, 45% acrylic, 160 m per 50 g).

Often yes, because the two weights overlap at around 23–24 stitches per 10 cm, but the fabric will be a little denser and warmer. Go down a needle size from the DK band's suggestion, then knit and wash a swatch before you start. Swapping sport for fingering rarely works one-to-one. If your pattern says sport, a true sport yarn such as YarnArt Baby (150 m per 50 g) avoids the guesswork.

Yes, YarnArt Jeans is a widely used amigurumi yarn: 55% cotton and 45% acrylic, 160 m per 50 g, with crisp stitches and little fuzz. The band suggests a 3.5 mm hook, but for toys many crocheters go down to about 2.5 mm so the stuffing doesn't show. YarnArt Jeans comes in 64 shades, and Gazzal Baby Cotton is similar on paper (60% cotton, 165 m per 50 g).

Look for soft, washable fibres with OEKO-TEX certification. Alize Happy Baby New (90% anti-pilling acrylic, 10% bamboo) and YarnArt Baby (100% acrylic) are easy-care choices for everyday knits, while DROPS Safran (100% Egyptian cotton) suits summer babywear. All three are OEKO-TEX certified, and sport weight keeps small cardigans and rompers light without making the fabric see-through.

Plan on roughly 1,100–1,400 m of sport weight for a standard knitted baby blanket, and more for cables, textured stitches or crochet, which uses more yarn. In 100 g balls of YarnArt Elite (300 m) that is about 4–5 balls; in 50 g balls of YarnArt Jeans Bamboo (150 m) about 8–10. Buy all balls from the same dye lot so the colour stays even.

Sport weight in wool or alpaca blends makes warm but light layers that fit easily under a coat. YarnArt Lana Fresco is 100% wool with 380 m per 100 g, Alize Angora Real 40 blends 40% wool with acrylic, and YarnArt Stylish Alpaca adds 25% alpaca. For outerwear in real cold, a heavier weight traps more air. At VILRITA the sport range also includes cotton and linen blends for summer.