Before beginning to care for kitten(s), is it important to determine how old they are and how healthy they may be. Knowing this will determine how you feed them, if they need external heat, if they need other medications, and more.
This chart can help you narrow down the age of the kittens:
Signs of a healthy kitten
Signs of an unwell kitten
EMERGENCY! If a kitten is COLD, LETHARGIC, CONSTANTLY CRYING – they may be fading! Please visit this page for more info on triage crashing kittens.