Don't worry ask as much as you want!
She was a right little wriggler in the womb, never stopped! To be honest when she was born and they said she was 'floppy' I couldn't see what they meant, aren't all newborn babies floppy?! It was only as she got bigger, and I realised she wasn't strong enough to lift her head and do other things that babies her age were doing that I actually noticed.
The nipple shield was provided to me by the breast feeding specialist on the maternity ward, but I'm fairly sure you could buy them online. I could look into it for you if you want.
She doesn't have any cardiac issues, thankfully. She had a small hole in her heart (same as most babies) called a patent foramen ovale which they monitored very closely at first in case it actually got bigger, but instead it gradually started closing and now it's almost completely closed.
As for the umbilical cord, when she was born the surgeon (I had to have a c-section as she was breech) found that the umbilical cord only had 1 artery and 1 vein, as oppose to the usual 2 arteries and 1 vein. It's called SUA and is fairly unusual (I think) which is why they picked up on it. I don't think there's any direct link with Down's Syndrome though, I think it was just one of DD's specific symptoms if you know what I mean. E.g. she doesn't have cardiac issues or any audiology issues, but she had SUA and was born with congenital cataracts. Just as all babies in general are different, all Down's babies are different too.
We had to wait so long for the results because the hospital were incompetent!! Well, that and that they did 2 tests, the rapid test (which came back all clear - because they didn't test for Down's as they didn't think she had it because she had none of the physical features) and then the cultured tests which is where (I think) they culture and grow the chromosomes (sorry, I'm no scientist!) and that's when they confirmed she was Down's. But she's quite an interesting case as she doesn't have Trisomy 21 DS, she has translocation DS. Which means the chromosomes form a different pattern, and neither DP or I are the carrier of the gene. So basically, it was an accident of nature!
As far as your question about whether she looks like she has DS or not, it's really difficult to say. I think she does, but then I know she does. For people that don't know she has it I don't think it's that obvious yet. But if I'm honest with you, the older she gets, the more the physical features are becoming apparent. She's quite young still, but it is becoming more and more obvious.
Sorry about the long answers, but I don't want to miss anything out! Hope it helps x