I'm in the exact same position - due this november and our wedding is february 2026! Baby boy should be about 3/4 months old.
It depends what kind of wedding you want. We've always wanted a relaxed, informal day with only 50 guests and no bridesmaids or groomsment at a farmhouse style venue so it didn't feel super overwhelming when we found out I was pregnant. We're also sorting out everything before baby is here - wedding favours, florist, ceremony details, paying suppliers, etc. We are meeting with the events manager at the venue next week to do the tasting and I'll then get formal invitations out so hopefully all I'll be doing when baby is here is chasing for confirmation and, if I'm honest, I'll probably get my mum to help tie the final few people down haha! What last minute admin are you worried about?
The venue is fairly local and we're planning to stay the night before - is that an option so you don't have to worry about transporting baby, dress, etc over early in the morning and can hopefully have a bit more of a restful start to the day?
The one thing I won't be sorting until just before is a dress (obviously) but I've never been bothered about that and will find something even if it's a high street number that's altered.
I'm actually super excited about having our little one at our wedding and he'll be the perfect age where he isn't mobile and can be passed around family for lots of cuddles - if you push your wedding date back you'll have to be minded that a toddler will be much more mobile and demanding in a different way!
Wedding nannies are also a thing and I've booked one for the evening to look after baby and do bedtime routine so it doesn't fall on us or family to do and everyone can relax. You can book them for all day/night if you'd like to but our family were adamant they'd help and I had to put my foot down at a nanny helping in the evening.
I'm also planning on bottlefeeding - if you're breastfeeding you'll obviously have to factor that in and that may influence what you want to do.