To want to leave my job over this?

[ThreeLittlePugs]

I've been working in this particular setting for a couple of years but over the last few months I've noticed this happening more and more.
I work in childcare and have been repeatedly put in room on my own over ratio for half or all day. It's not just one over ratio but two or three.
I have spoken about not being comfortable with it on multiple occasions and always am assured it won't happen again, it was just a mistake/no other option. but it's happened about 5 different times now.
What really gets to me is I'm then criticised for not getting all my paperwork done on those days or not doing extra jobs as I am completely run off my feet.
I'm so stressed with it I've started dreading going to work. I feel so exhausted when the day ends that I just come home and go to bed.
Ive not worked in any other settings before so dont know if this happens frequently in other settings.
AIBU to want to leave and find somewhere else?

It doesn’t happen in other settings!!!! Please leave, early years practitioners are in very short supply, you won’t atruhgle to get another job.

I would report your employers (not sure to whom - OFSTED?) For repeatedly being over ratio.
If it happens again and you make a complaint/comment, do it in writing or by email to keep a record. Keep a record of what dates it happened before. At least this way your back is covered if, God forbid, something bad happens on your watch.

In the meantime I probably would start looking for another job. If they're lax about this what else aren't they doing?

Get out asap.

If anything goes wrong it is your head on the block.

That's what worries me, that something bad will happen and it will be my fault.

It doesn't seem fair to do this at all. Would it be worth talking to Citizens Advice about this?

www.citizensadvice.org.uk/work/leaving-a-job/dismissal/claiming-constructive-dismissal/

Have you reported this in writing to the safeguarding lead? Note all times/dates when this has happened and who you have reported it too. Take a copy before you hand it in.
This may help too:
www.nspcc.org.uk/what-you-can-do/report-abuse/dedicated-helplines/whistleblowing-advice-line/

This is not normal for early years settings, you're right to be concerned. You need to leave for your own wellbeing.