How to tell guests kids aren’t invited?!

Looking for some advice please!


Background… should have been married in Sept 2020, kind of “destination” wedding as it’s in England but we’re from an island so everyone will be traveling. Tight on numbers and back then we planned a family kids only wedding as forked out a fortune for a band / DJ etc and wanted everyone to let their hair down and party all night, but didn’t want to exclude our nephews etc who are a big part of our life. Though said to friends with under 2s if childcare etc means you can’t be there we’d rather they came as a family than not at all as appreciate it’s not as easy leaving babies at home.
Fast forward 2.5 years and 2 cancelled dates later and we’re now getting married April ‘23. But since then so many of our friends have gone on to have kids, and a lot of the original babies who were coming are now over 2 and count towards the headcount and cost (something like £25 per over 2!). We also have since gone on to have our little boy who will be 15 months old and very much a part of the day.
How do we politely say we still wish to have a child free wedding even though we now have one of our own?! I feel very hypercritical! But I’ve counted up and if all the babies / children come there’ll be 30+ kids 😬 we weren’t planning on sending any more invitations etc out as everyone has had the new date card, so thinking a generic send to all message, but what do we say?!