Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to treat fleas in young kittens and nursing mothers [title] Use flea medication on the mother only. [step] Harsh chemicals are not safe to use on young kittens, especially newborns. Instead, you can gently bathe newborns using a dish soap.

Ending1: Apply a drop of the insect-control product to the skin and let it sit for 10 minutes. [substeps] To prevent the product from drying out, only use it with warnings and no topical medications. Ending2: Choose a mild dish soap that does not have antibacterial properties. [substeps] Fill a sink with warm water and soap. Ending3: You can then sprinkle a moist, flea-killing substance over the affected areas. [substeps] The instructions on the medication or the bottle could also suggest how often to bathe your kitten. Ending4: Then, rinse the mixture off, and apply the medication to the kittens. Take it off with water after 20 to 30 minutes and [title] Wash the mother once a day for 3 days.

Answer format: ending1/ending2/ending3/ending4