Issues with cats and baby on the way - any one have any similar situations?

So we have three cats with baby on the way. One is very good and almost protector cat (he is very much like a dog actually). The next one who was quite nonchalant and disinterested at first is now all of a sudden VERY bad - juping up on to things, scratching the new carpet we installed, just bad in general. The third one totally has a horribly insecure attachment. We got him when he was three and he had been discarded by his previous owners as they were having a baby and decided you can't have cats and a newborn (STUPID). His three year old companion who he was taken to the Humane Society with died while there as he got so depressed, he would not eat. Ours was not far off when we rescued him. He has done so well here but lately has been VERY meowy, follows me everywhere, wants to constantly sit on my lap, has not reacted well to being locked out of our bedroom at night (in preparation of having the baby in there wiith us in his binet the first little while) and howls like he is being beaten almost. The kitties also have NO access to the babies room and haven't since we decided it would be the babies room. They have their own bed to sleep on with soft, comfy bedding, get lots of playtime and snuggles and really are treated like out "first kids". However, the closer we get to baby arriving, the worse the two of them get. Anyone have any experience with this? Getting rid of them is NOT an option as we have all the safeguards in place and would only consider that if our child was deathly allergic. Thank you!