stress/digestive/new baby

Question
We have 2 7-year-old female cats and a 6-week old baby. Everyone seems to be getting along fine and the cats don't seem jealous or aggressive around him at all; our cats have always been very sweet and at ease around humans. One of our cats, however, seems to be a little frazzled. She used to crave (and receive) a TON of attention, definitely not the alpha cat and a real baby herself, and now it's impossible to give her as much. She is more withdrawn and seems to really get frazzled by the baby's crying. (We live in an apartment in NYC so there's only so much distance we can put between the cat and the baby.) This cat, Lily, has ocassionaly in the past vomited in the morning, mostly yellowish bile, that I think stemmed from her being hungry and over-excited for her daily wet food feeding. But I've noticed lately that she's been vomiting more frequently and also, disturbingly, seems to be regularly clearing her mouth of some sort of liquid or something that's bothering her--a behavior she only used to do right after vomiting but now it seems that she's doing it without vomiting. Do you think this sounds like stress related behavior? Or should we worry that there's a digestive issue as well? It seems too coincedental that it's happening since the baby's been home. If it is neurological, do you think she'll feel better eventually? Thank you.  

Answer
Hi Skip!  Firstly, congrats on your new son!  You must be so excited!  My husband and I are expecting our first child by the end of next month!  It is thought to be a boy as well!
This situation could definately have been brought on by the stress of the baby.  I would, however, think that after this many weeks, the cat would be getting used to this and the symptoms would be decreasing...not increasing.  Digestive issues are always a possibility, and I would suggest having your veterinarian checking her out to be sure that there are no health related causes for this behavior.  If it does turn out to be stress, your veterinarian will be able to give you something to slightly calm her so that these stressful feelings can pass.
Please let me know how she does, and congrats again!
Hilary