6 year old is sad to only have 2 words to say in nativity

Your son might be right but it's not often a six year old is right when they say they are the "only one" or "everyone else has xyz except me" Let the nativity go and encourage him to say his two words nice and loud and clear.

What is the certificate for? That could well come his way later in the year.

To the person who said someone was a tree in a play: I was a wall. Seriously, a wall!!

You should say something op. In my experience, teachers over look some of the children in favour of others. It happens all the time (usually to the same kids)
He feels like this for a good reason. Don’t worry about being ‘that parent’. Advocate for your Son op.

He probably did if they keep rewarding them and telling them that's why they got it.

I would raise it op, but don't go in guns blazing as sometimes children don't have the facts right: there might be only three people with more lines than him for instance, in which case you will look like Attila the Mum.

If you don't advocate for him, no-one else will.

You don't want to be the pushy mum but there is a balance if you don't want your dc always pushed to the bottom of the pile. Those nursery certificates get handed out in order of the pushiest to least pushiest mums!

This term is about 12 weeks long. If a certificate is given at the end of each week, that's 12 children who will have received a certificate. If he's moping about this, don't encourage it. It's trivial and more than half the class won't have received a certificate yet.
As for the nativity, I'd be surprised if everyone else had more words. Most parts in the nativity are non-speaking, eg sheep and shepherds and angels, and of course Mary.

That's quite likely if it's one of the school values (or whatever terminology the school uses).

One of our school values is resilience so a lot of 6 year olds know and understand the term - which I certainly wouldn't have at their age.

Practice his two words so he is proud of them and the part he’s playing in telling the story - some children won’t have any words

re certificates, most schools will only give one certificate a week. We're still in term 2 so most children won't have been given one yet. He might feel that everyone else has had one but that's very unlikely.

I'd tell him that his turn will come and encourage him to focus on the positives at school rather than the negatives. If he still hasn't had a certificate by summer half-term, that's the time to mention it to the teacher as - even at a rate of one a week - in an average class of 30 children, everyone should have had a certificate by then.

Is he doing lots of singing? Big that up.

No, I think you should be bigging your son up for his amazing two words.

Sure mention the certificate though. Did your 6 year old really say "I've shown perseverance!"?

What is his part? One girl in DS’s nativity is a tree. She does not have many lines. Agree that you should wait until you see it as 6yo’s are not reliable narrators.

I'd leave the play thing because it's extremely unlikely that EVERYONE has got multiple lines and scenes except him. Wait until you see it before you speak to the teacher. I think you'll find lots of kids have a only a couple of words/one scene.

I'd mention to the teacher that he's feeling disheartened about not having received a certificate yet. It's good for them to know that his morale is low so they can help encourage him/perk him up.