To be fair, even the SPCA info said that lavender oil is, at worst, a mild irritant, not fatally toxic or anything. I still wouldn't use it on baby kittens though. Maybe you could just put a bit of the oil on tissues and stick the scented tissues in places near the nest but not super close to the kittens.
You can bathe them, Dawn dish soap (not citrus scent) is good but really any safe shampoo will help drown the fleas. If you bathe them, make sure you don't get water up their noses, and make sure they're rinsed very well and fully dried in a warm, draft-free area. You can also flea-comb them, that's the safest way. But the fleas definitely need to go. They can suck a baby kitten dry in no time .
You can bathe them, Dawn dish soap (not citrus scent) is good but really any safe shampoo will help drown the fleas. If you bathe them, make sure you don't get water up their noses, and make sure they're rinsed very well and fully dried in a warm, draft-free area. You can also flea-comb them, that's the safest way. But the fleas definitely need to go. They can suck a baby kitten dry in no time .