Hi,
I'm a student single mom to a one year old in England and this is how they worked it out for me.
First of all, my student finance is only deducted for 8 months of the year (pound for pound), 4 months of the summer period I get full UC as normal.
So whatever maintenance loan I get is divided by 8. For example
8,000 maintenance loan. Divided by 8 is 1,000 a month. You get £110 a month of student finance disregarded. So £890 a month would be deducted from my Universal credit.
So if I usually get £1100 UC, £890 would be deducted and I'd only get £210 UC, but get £1000 student finance so never actually end in a worse position in that sense.
And then 4 months in the summer I'd get my full UC as normal.
You can speak to your work coach and they will tell you their policy.
I also get childcare grant so 85% of my childcare costs are covered (this can include anything OSTED registered and before/after school clubs).
Hope this helps 