Can be knitted in 3ply, 4ply or DK to give different sizes.
5 different sizes available to knit in 3ply or 4ply. 3 sizes available to knit in DK.

If knitting in 3ply, use 2.75mm needles
If knitting in 4ply, use 3.23mm needles
If knitting in DK use 4mm needles

Check with your local NICU that they are able to use this before making, as not all places are able to.