So far (my baby is 4 months), my two cats do not show any signs of jealousy. One of them is so curious about the baby that it comes near to have a sniff/touch now and again, while the other one seems does not give any care. I used to play with them, cuddle them, brush their teeth, etc. but I must admit I don't spend much with them now since my baby is born due to the lack of time & energy. Hope jealousy will not grow in both of them.