Firstly: Congratulations!!!
This must be an uncertain and worrying time for you and you must have a million questions, which is completely normal.
My DD has DS, it was diagnosed at birth, and if I'm going to be completely honest with you, I was absolutely devastated. I just instantly started worrying about her, about her future, her health, her happiness. But now, looking back, I'm not quite sure what all the fuss was about :)
Initially there were lots of appointments, and this was a little over-whelming at times (mainly because I'm totally disorganized), but these reduced with time, and I got used to juggling things around.
DD is now 15months old and really is the light of my life. She doesn't have any cardiac issues, thankfully, and her hearing is fine, but she was born with cataracts so needed an operation at 8 weeks old and now wears contact lenses, she will always have quite poor vision.
She can't do a lot of things other NT babies her age can do, but there are some things that she CAN do that other babies her age can't (e.g. she sleeps through the night - sometimes 13hours - and always has done!) Her personality makes up for everything she lacks; she is fiercely determined (i.e. she cannot crawl, let alone walk, but makes her way around the house by rolling everywhere :) ), she's stubborn and bossy, she's cheeky and hilariously funny, and she's sociable and loving, she LOVES being with her family.
I'm not going to lie, I do still have dark moments where I worry about her future, but all it takes is one cheeky smile or wave, a raspberry or a giggle, and I just melt and forget all about it. Everyone who's met her has completely fallen in love with her, and doesn't she just know it! :)
She's doing very well, and I'm so proud of her everyday, and she has taught me that love and happiness really are the most important things in life. She is loved and she is happy. Therefore so am I.
Hope this has helped you a little bit. Any questions, fire away, there are plenty of us around who will be happy to try and answer.