Hello. I am really feeling bad for my cats. Especially the 4 month old kittens (I have 2). My adult cat also has fleas but it doesn’t seem like they are as bad as on the 4 month old kittens. The adult cat spends most of her time upstairs and the two 4 month old kittens are downstairs. The adult cat had kittens yesterday and I am afraid they will get fleas as well. I don’t know what I can do to get rid of the fleas safely and quickly. I did vacuum around the house and I put the flea collar on the two 4 month old kittens who do not ever come upstairs. The 4 month old kittens look so uncomfortable….and I feel bad because they are so loving. I don’t see any scabs on them or anything but I do see flea droppings near the tails. I don’t know much about fleas as I have never experienced them with pets. I don’t know if it helps but the adult cat is an outdoor cat. I don’t know what type of products to get or which part of the house I should focus on. Please help. Thank you.
One more thing…could the fleas survive in the unfinished basement? The two 4 month old kittens play down there a lot. Could I close off the basement and bomb it safely?
Should I take the flea collar off of them before spraying them with Frontline? I’m sorry…I really have no clue about pets and fleas.

Thank you.