The point isn't so much about what words you chose - the point is to offer kind words, in whatever form, whether they are spelled c-o-n-g-r-a-t-u-l-a-t-i-o-n-s or not. It is just the right thing to do.
The PC&KC Forum here at TCS can be emotionally charged, on many levels. We have those who have a newly discovered pregnant cat, whether rescued, adopted as a stray or the family pet who accidently got out ... and those poor folks don't have the first foggy clue how to care for her. They are scared, they are embarrassed, they are mad ... whatever they are feeling, it is safe to say they are upset and tend to run the entire spectrum of emotions around it. Not to say something like "Welcome, we've been where you are and know a little about how you must be feeling" would be insensitive. So we welcome them, even knowing they are adding to the pet overpopulation crisis. Then, we have those who are near to an impending delivery with a thousand questions; again, they are scared, they are nervous, they are upset. Not to say something like, "Awww, it'll be OK, just remember to breathe." would be insensitive, again even though we know they are adding to the pet overpopulation crisis. And while that delivery is taking place ... and they are, many of them for the first time, experiencing the miracle of birth, they are scared, they are in awe, they are overwhelmed with it all - not offering support and encouragement by saying things like, "You are doing fine, just keep watching for problems and we are here if you need us" would be insensitive, even though we KNOW they are adding to the pet overpopulation crisis. And finally, once the whole ordeal is over and the kittens are dry, nursing, and the new little family is settled in ... we offer congratulations. We offer them to say, "You did great! You cared for that pregnant cat during a most difficult time and you got her through it! Yay for YOU!". I don't see offering congratulations on a new litter as celebrating the birth of kittens as much as I see it as acknowledging the person.
It has been proven, time over time again, that offering positive encouragement wins the day. You succeed at allowing that person to feel welcomed, which makes them want to return. When they return, you can offer gentle refreshments in the form of a lesson on responsible cat care along with tea and sweet biscuits ... because they like being here and are more apt to hear your message. You become their friend, because people are more willing to not only listen, but to follow the advice of FRIENDS.
So, you see, in the end, it really matters not one iota what words we choose so long as we remember to be welcoming, friendly and supportive.
Let's break it down to a more managable chunk:
If you are uncomfortable posting congratulations in the TCS Pregnant Cat and Kitten Care Forum, then by all means, please don't. If you are comfortable posting congratulations in the TCS Pregnant Cat and Kitten Care Forum, then by all means, please do.