Moosmom is right. Fleas can multiply at an alarming rate. We too also lost one of babies to fleas. I'm one of the first to get the bites. Now if I even think there a flea in the house, and YOU could bring them in, I round all kids up load them in the trailer and bomb the house. One good thing is the bombs kill all the spiders and centipedes too. The bombs I use we have to be out of the house for over 4 hours. When we come back in each kid goes right to the bath tub for a flea bath. the whole process takes us 9-12 hours. The last time we did it we only had 9 cats, now we are 16.