What to do with Found Kittens
Have no fear! Their mother is near! Mothers are often out roaming for food and resources and are almost always caring for those kittens. For more information, see this link from Alley Cat Allies:
Monitor from a safe distance
Monitor from a safe distance where mother cat will not see you. If she has not been seen within 6-8 hours, or if the kittens are in immediate danger, carefully place them in a safe and warm box or carrier. DO NOT GIVE THE KITTENS COWS MILK! They cannot properly digest it. If you choose to attempt raising them, we recommend watching YouTube videos from Kitten Lady. She had created videos for nearly every question you may have regarding orphan kittens and how to properly raise them.
Kitten Lady videos on raising orphan kittens: https://www.youtube.com/results?search_query=kitten+lady
How old are the kittens?
See this aging chart https://www.alleycat.org/resources/kitten-progression/
A Final Word
Caring for an orphaned kitten can be difficult, and even the most conscientious foster parent may lose a little one. If a kitten dies, the substitute parent should not blame him- or herself.