Wow I had to do a double take when I saw this post as this is almost exactly what happened to us, same age baby, except it was my stepmum’s birthday party and she disinvited us.
We were due to attend, our first event since having DS, but I wasn’t comfortable with the idea of passing him around as I didn’t really know any of the attendees barring my dad and stepmum. So we sent a message saying we were really excited to see everyone but that as DS was a bit under the weather we’d probably keep him with us, hope that’s okay and see you soon.
She messaged back saying it would be far too stressful to ‘keep DS segregated away from everyone’ so it was best we didn’t come. Just straight up disinvited us.
To be honest it was the latest in a long line of issues we’d had since we had DS, stepmum would frequently make shitty snotty comments about how we were doing everything wrong, stuff like how we were insane to keep him in our room for six months, how I was overly precious for not wanting total strangers to come up and touch him (which I stand by!) and should buy a ‘hands off’ sign for his pram, how we were stupid for not starting solids until 6m and so forth.
This was the straw that broke my back and after the party was over I sent a message saying that I was sick of being undermined and judged for every single decision I’d made, she had her time raising her son and now it was our time to do things our way whether she agreed with it or not, and that I expected her to be at least silent or civil in the future in my house when she wanted to say something negative about our parenting.
It stopped the behaviour in its tracks and we’ve moved on fine.
I empathise with that horrible feeling, I was so looking forward to going, it was a big deal for us (first event, first time we’d been away from home with him) and when she told us not to attend it was like a punch in the guts.
Personally I wouldn’t go in your shoes. I wasn’t keen on the idea of passing DS around a group of people who I didn’t know well who might have been drinking or smoking or not know how to hold a baby and so forth. Don’t let anyone tell you off for being precious, this is your child and if you’re not happy with others holding him then that’s entirely down to you as parents and very normal at such a small age.