Of course you have "the right" to feel however you want. But I can't imagine anyone frowning upon this couple the OP mentions without knowing the full details of why they waited to get married.
My cousin had a big wedding *her second, his first). She had a 4 year old from her previous wedding and a few months old baby with my cousin. They got married in that order because;
a) that's when everyone's various schedules meshed.
b) the hall could accommodate them
c) they had the money to cover it.
You see, that's what I think it all boils down to in many cases. The
wedding becomes more important than what ought to be front and center......the
MARRIAGE. If I was unmarried, pregnant, but my BF and I were already planning to get married when we got the baby news, then "the wedding" would be the last thing on my mind. I wouldn't be concerned with anyone's schedules except the one that added up to 9 months. Simpy put, I'd want to be legally married before that baby arrived, provided he was someone I'd marry at all. If he was a loser, then all bets are off.
Over the past 15 years or so, I have seen a disturbing trend among couples in which the wedding is a near obsession and it seems precious little thought is given to the actual marriage and what it means. The wedding is one day and in truth, insignificant to your lives in total. Whether there is a baby involved has nothing to do with it, BTW. Pregnant, not pregnant...it doesn't matter. There is a reason the term "bridezilla" has been coined. Too many people are somehow under the delusion that the goal is a fancy, glorious wedding and once that is achieved.....Oh.....Well, what DOES happen after that?
I'm a practical person. If I was pregnant, I'd want to be legally married for many reasons. (again, assuming he's marriage material.) Some of them are moral, but many are for the protection of the child, legally and financially. I could quote all sorts of stats, but I have solid reasons for this opinion. Long story short, most girls who get pregnant without benefit of marriage find out the guy just isn't that dependable. The girl ends up bearing the burden of raising the child. In this case, the couple did get married, albeit when the child was a year old. For me, that's bassackwards, but it looks to be a solid foundation for the child, so that's a positive thing.
Look, I'm not going to pick up a rock and start stoning someone for getting married after they have a baby. The OP asked if it was appropriate to have a big wedding when the couple has a one year old and I'm sure she was aware that some would say, "Absolutely" while some would say, "No." Heaven knows it's better than what happens in many instances when the couple splits up and the baby winds up having very little contact with the father, and often little support of any kind. So overall, I think it's good that they got married, but truly....They don't care what I think.
Would I refuse to be friends with someone over this? No. I'm sure there are things I've done that others aren't thrilled with. I don't expect to please everyone. I do what I believe is right because at then end of the day, I'm accountable to ME. This couple did the same. They just didn't do it the same way I would have. I have no idea why they did things the way they did, so like everyone else on this thread, I'm speaking in generalities.
As I often tell DD, if everyone was exactly the same, the world would be a very boring place.