Mum is blocking my 2yo’s invites to play dates

Because 2 year olds don't go to school.

If you have it out with them, you'll just give them more ammunition to convince them they're right to step back from you.
They've made their choice to step back so anything further from you is a reflection on you.

Because your child is a toddler, therefore not at school!

I don’t agree that C is necessarily a stirrer. If she if your friend she is being put in a difficult situation. How long would you expect her to remain silent and how awkward would it be for her when you did find out had she not told you?

Overall, this is common, when you have a child you are right back in the playground with them and when you first encounter this behaviour it is quite gobsmacking that an adult would behave in such a way as to exclude a child (thankfully your child is too young to understand, it’s harder later).

But as mentioned above, do not engage, it’s nearly always a mistake.

Try not to get too het up about this.

Firstly, at 2 years old, play dates are more about Mums than they are lthe kids. Little kids that age don't really play together very much, it's more they play alongside each other. All they need is a loving, present primary caregiver. It's the mums who benefit from social support.

Also, you have no idea of what's actually going on behind the scenes here. You have no idea of what Mum A's motivation is. Anything could be going on for her or it could be that she just doesn't like you. This might not be pleasant to realise but it is inevitable that we can't like everyone we meet.

Similarly Mum B - a month isn't long to stay out of touch with a newish friend. Particularly over Christmas. Try not to read too much into it. If you like her and value her company talk to her normally and maybe offer up a new play date arrangement.

Finally Mum C. What a stirring bitch - what possible good could it do you to know that someone had an unpleasant expression on her face when your name was mentioned?
Assuming it's true that this expression happened it could have been indicative of indigestion or an unconnected random thought, rather than an opinion of you. Even if Mum C is right in her intuition that Mum A dislikes you, what is her motivation for passing it on? To make you feel bad? To drive a wedge between you and the other mums?

Do not trust Mum C. If she is telling you unsubstantiated tales about mutual casual friends you can be sure she will also be passing on anything you say as well.

Chill out. The beauty of adult playground relationships is that they are only a small part of your life, not your whole world. Stay calm, friendly and open and as well as realising not everyone is going to be a BFF or even a Casual FF you will make some solid friendships. I'm in my sixties now and some of my closest friends are onetime school mums.

Also when is your little one turning 3? You could organise a class party and get some other parents numbers that way (by adding your number to the RSVP). And don’t invite mum A -just kidding

When the kids are old enough for actual school, none of this will matter anyway. So I'd just stay out of it all.

I really wouldn’t bother getting entangled in this, B made her position clear already

I really think you are over-dramatising the effect on your son. At that age children tend not to be that bothered about play dates, and your son really won't have been moping at home wishing he could go and see his friends. A and B weren't thinking up ways to make his life miserable, they were simply making their own arrangements for their own social lives and presumably assumed you were doing the same.

You say you went to B’s home for play dates - did she ever get invited to yours? If not I’d text her breezily and say ‘Hi mum B, feels like we haven’t caught up properly for ages, how are you? Would you and child B like to come to ours for coffee/lunch (delete as appropriate’

Try and get on your own with B and then try and ask her if you’ve done anything to offend A as you got a vibe there’s an issue.

If she still ghosts you or declines then text B and ask if all is ok.

First it was "most" of their "little" school; then it was the entire class, plus the one above and below, except for your son; now it's the entire school? You seem to be trying to make it sound worse and worse because not everyone is agreeing with you.

Also, sorry to be pedantic, but surely you mean nursery?

Stop making ‘friends’ with school mothers. It is far better for your child for you to have ‘working relationships’ with other parents and your own set of friends outside of the nursery/school.

Your child can choose their own friends, develop their own interests independently of you/your vested interests. Inevitably the groups become really tricky with different issues, and you will be saving yourself lots of stress and grief by being one step removed.

Be warm and inclusive to everyone. Throw the social net far and wide for your child and ignore the petty and immature behaviour. Friend C is not your friend and I would stop socialising with all three.

Yes that's extremely mean. It's not personal to you though. It shows how awful these people are. Things will no doubt change and someone else will be the target soon enough. Rise above and organise your own stuff.

Bizarre people are going in on mum C when she seems like the ideal friend to me, she had your back when you weren’t there and told you the truth about what had gone on? Keep her!
the other two can fuck off, your toddler will make other friends and these women will cause years of unnecessary drama so you’ve dodged a bullet there

The children are two! It’s not any kind of ‘school meet up’!

Don't feel excluded. If you would like to meet up and do something with these Mum's, you initiate it, you invite them. Leave out Mum A if you want. Just because one Mum feels one way doesn't mean you are excluded from a relationship with the others. Apart from anything else, why would you give anyone that power over you?

Have you been talking about private school? That could explain it.

Anyway if your 2 year old would love to see his friends over the holidays why haven't you organised something yourself? If these 2 bitchy mums don't want to come I'm sure you would find some others who would. Being the organiser always makes you more popular and confident IME.

It is hurtful, but I would just move on and find new mum friends.

Your 2 year old will not miss his 'friends' over the holidays, he isn't old enough to have firm, solid friendships and will be happy to play alongside any child.