Wedding- one child and not the other

[Susanna85]

AIBU to this it's odd that one of my children is invited and one isn't.

My oldest friend, godmother to my DC (6) and bridesmaid at my own wedding has invited my older child to her wedding but not the younger (1).

I feel weird about joining as a family of three and leaving one behind. If we can even find suitable childcare.

I was never bothered either way about weddings being child free until
a toddler belonging to the best man decided to stand near daddy and shake a bag of quavers noisily all the way through the vows laughing making it hard for anyone to hear whilst both parents smiles indulgently, this being after dd as a toddler and I were made to wait in a side room at their wedding a few years earlier. Now I totally understand where the bride and groom are coming from when they say child free. Ten years on and a divorce later I still am bitter

"Bunch of precious bridezillas shrieking 'THEIR WEDDING, THEIR RULES' because they have no idea that hosting an event is about being gracious to your guests above all else."

Well if that's the case then of all the dozens of weddings I have been to in my life, none of them got the memo! Are you really saying that you'd bend over backwards to accommodate every single guest's choice(s) at your wedding even if that meant you really didn't enjoy what is supposed to be one of the best days (and most expensive!) of your life? Because there are choices to be made and if you prioritised every guest you'd have a nervous breakdown before you even got to the ceremony.

I've come across a lot of bridezillas but I don't think the definition is someone who just wants their day to work for them, too.

until a toddler belonging to the best man decided to stand near daddy and shake a bag of quavers noisily all the way through the vows laughing making it hard for anyone to hear whilst both parents smiles indulgently

that's a parenting issue, not a child-at-wedding issue though. Like another Irish poster, here it's usually a given that the only children expected to be at a wedding is nieces and nephews or children of the bride or groom - ie family children. When my sister with a newborn was a bridesmaid for her friend, Mum was upstairs and sis went up intermittently to breastfeed. I'll have lots of kids at our wedding but again, it's family children. And even then, lots of parents opt to have a babysitter lined up in the evening so they can enjoy themselves properly. People rarely take offence if you don't invite their children to an Irish wedding and invariably the ones who do have a massive problem with their quaver-eating angels not being invited are the very ones who probably omitted even family children from their 'wedding vision'
OP, just decline for the children, get a babysitter and enjoy the wedding if that's what you want. Or turn down the invite entirely.

Fine for her to only invite some of you, fine for you to say no thank you.

Actually I think it's quite rude for her only to invite some of you, but fine in the sense that her wedding her choice.