kitten lady has several good videos on this, but I’d strongly advise you to get in contact with a local rescue. They can care for and find a home for the kittens (once they’re old enough) and spay and release mom (once the kittens are weaned). They should keep mom and kittens together until they’re ready to wean. Main concern with bathing the kittens is that they can’t self regulate temperature at that age and you put them at risk of hypothermia by getting them wet.

Source: kitten foster parent