How old is the kitten?
What formula do do have?
If the baby is quiet and content like you say then she is gettin enough milk from mommy.
When a kitten is hungry it is restless, crying, whining and fussy. It also cannot sleep well.
So it sounds like she is fine but keep a close eye on her for any problems so you can take right over:
Here are some links to how to feed and raise an orphan kitten: http://www.catvet.homestead.com/orphan1.html http://www.fanciers.com/cat-faqs/orphans.shtml http://www.kittenrescue.org/handbook.htm http://www.marvistavet.com/html/orphan_kittens.html One of them recommends goats milk and give you recipes for home made kitten formula.Use a dropper if she cannot drink from a bottle. Just keep her warm and well fedMay God bless you for taking such good care of her. Please let me know how the baby is doing. If you have more questions along the way, I will always be here for you and happy to help I hope your baby will be fine. Very sincerely, Terri