You should be entitled to benefits over the universal credit. The calculators are not always nuanced enough to deal with student parents.
You should be entitled to the housing, child and individual elements of universal credit.
If you are in private accommodation, the housing element may not cover it all - they will have a cap on it and I think would have a set amount they pay for a two bed property in your area (even if you have more bedrooms, I think this is what they would say you and two small children are entitled to.)
They do take your loan into account but certain portions (special support element, which would be indicated in your letter if you have it, and parent learner allowance) are disregarded, and they also disregard another £110 per month (in 2019-20 anyway). They divide what is left by the number of months your course runs for in the year (is it year round for midwifery?) and subtract that from your monthly entitlement.
The childcare grant also does not affect it either. You can also earn a certain amount from work without reducing your UC. You may find that once on UC you fall into the bracket of being entitled to 15 hours free childcare for your one year old once they turn two.
Any eventual child maintenance payments should not count.
This is a good site and calculator which was absolutely accurate in 2019-20 www.uceplus.co.uk/student.html
Advisors do not always know all the information so if your entitlement is not what you expect, you should ask it to be reviewed by a decision maker and set out the calculations for what you think it should be and why.
Good luck! I’m a single parent medical student in the north. Maybe we’ll cross paths!