step 1 • do 2, level 2 and level 3, qualifications at open uni (i can’t go to college due to not getting enough gcse’s), in child development and biology courses
Have you spoken to the colleges about their entry requirements? Sometimes there can be some flexibility e.g. doing a L3 BTEC in health and social care alongside resitting your science GCSE (congratulations on getting grade 4 or above in your English and Maths!)
step 3 (part A) • do an honours at open uni, in children and young adult nursing, which says i must be working in a relevant environment, and have the support of my employer.
The Open Uni is fab, but you've got 5 choices on your UCAS form that you'll need to fill out, and children's nursing is competitive so you need to think about options other than the OU.
You will also need to check with multiple universities that they will accept your OU L2/3 qualifications for entry. If you're not sure, drop the admissions team an email and ask - they're always super nice and these enquiries are a big part of their job. I'd hate to think of you in a situation where you study hard and then find that the qualifications you've done aren't sufficient for entry!
One route you don't appear to have considered is a foundation year, after doing your L3 qualifications, such as www.surrey.ac.uk/undergraduate/nursing-studies-registered-nurse-childrens-nursing#entry
As for getting a job right now - if you can fit a job around full time study and a baby then I seriously take my hat off to you (do you have a supportive family?). Care homes are a really good option - though your age (insurance?) and the current covid situation may make things trickier as you can't have been vaccinated yet. When applying for nursing degrees, admissions tutors really want to see work in a caring capacity - this doesn't need to be in a hospital!
step 4 (part B) • OR, do a nursing apprenticeship, but i don’t know much about this route.
It should be noted that degree apprenticeships are fab, but insanely competitive. Do apply if you feel it's the right option for you, but keep your options open and do a UCAS application too!