The charities have a lot of information on their websites, below is some general advice to help you get those needles clicking.
Bliss also use Knitted breasts. The knitted breasts allow nurses to easily demonstrate to women important massage techniques that let them stimulate their milk production and express their valuable first drops of milk. They are particularly helpful when there are language barriers. Woollen breasts are a brilliant free alternative to expensive teaching aids that are used by health professionals to educate new mothers to express by hand before going on to use an electric pump.
Feed the Children: Feed The Children is a UK charity that has a knitting pattern for a jumper appropriate for children of all ages. They are also look for knitted hats, gloves and scarves.
The charities involved usually have free knitting patterns and advice on their websites so do not be worried by all the details as you really will be able to find a garment to suit both your knitting skills and the babies needs
Another very practical item to invest is a chart keeper, which is tool that can be used to keep and display patterns and charts, all whilst working on a particular project. The chart keeper can be opened out and stood up to place patterns in for easy reference when working on a project, and then folded up and stored away when not in use.