Hi, Emilia, thank you so much for rescuing this kitten, you rock!
Human baby milk is not enough for kittens usually, so if you are still using this, make it up to double strength, though canned or fresh goats milk is much better still, if you can get it. I’m going to give you our favourite sites for helping to raise orphaned kittens, they also suggest emergency formula recipes for kittens (also called kitten ‘glop’) of ingredients that you may have at home, eg condensed milk, mayonnaise, yoghurt and gelatin.
You’ve gotten the pedialyte formula (boiled cooled water, sugar, salt and baking soda) from CBM above, so if baby is dehydrated, this should help. At four to five weeks, she should be at least trying solids, what are you giving her?
Does she have fleas? This is very important as they can cause anaemia that can kill little kittens. Don’t use over-the-counter flea treatments as they are probably much too strong for her at this age. A flea comb and/or — if they are really bad — a quick wash in warm water and a gentle soap are best. Dawn or Fairy Liquid are good if you have them. Lather her neck first so the fleas don’t all rush to her head (don’t lather her face) and make sure you dry her off very quickly and very well or she may catch a chill.
Here are the kitten sites:
http://feral-kitten-rescue.blogspot.com/2008/10/feral-kitten-how-to-story.html
http://www.messybeast.com/handrear.htm
http://www.kittenrescue.org/pages.php?pageid=15
http://www.fanciers.com/cat-faqs/orphans.shtml
http://www.feralcat.com/raising.html
And here is another site with glop recipes:
http://www.hdw-inc.com/glop.htm
This thread may also help:
http://www.dailykitten.com/chat/topic/31099
And if you can find a good vet, please get her checked over as she may be sick. Best of luck and please let us know how she’s getting on.