I was wondering if anyone might know when u can treat kittens for fleas? My kittens are 5 weeks old now and I found a flea on one of them..are they to young to treat? Also what would be a good cheap flea treatment? We have the momma cat, 5 kittens, another cat who is pregnant..so the cheaper the better. In the past I used frontline for our cats and dog. But with an extra 5 kittens and funds are low I was hoping to find out if there is a good cheap flea treatment out there