The charities have a lot of information on their websites, below is some general advice to help you get those needles clicking.
Other smaller accessories that can be particularly useful when working on a knitting project are stitch markers, which can be used to mark particular points in a pattern that you are working on. These often come in the form of small rings which can simply be slipped onto your knitting needles as you knit.
With knitting being a very popular hobby in many countries around the world, there is a huge number of retailers all offering various thicknesses of knitting yarn, along with a variety of knitting accessories that are claimed to be more or less essential for various projects.
Yarn: Premature babies have very delicate skin and can often be allergic to wool; therefore it is best to steer clear of garments made with a wool mix. Acrylic yarn is more appropriate when knitting for preemies. Ideal yarn to use for preemie knits is baby double knit or 4ply yarn. Most preemie patterns will use these.
Bliss: One of the many ways that you can support Bliss is by knitting for babies in special care units. Knitted items are most helpful for babies about to go home, but there is also a need for blankets and hats for babies in hospital. Knitted items are often not suitable for intensive care units – stitched cotton is preferable. However for larger babies, and in high dependency and special care units, knitted items are often very welcome.