It makes a difference if you have more than one child though I suppose that's a daft thing to say.
I'm the closest to NT - sister's severely autistic, mum is disabled with seizures/vertigo/anaemia etc. Not having a sibling or a nearby relation who can help me makes it very difficult indeed and can be very lonely. Once you hit 18 as well unless you choose to spend all your time at home and not employed - i.e. a full time carer - all support drops, it's a bump.
If you did choose to have a child knowing you were disabled it would be responsible to have a good idea of what support was available to that child.
There is a complete lack of support for carers of all kinds .. Worst was when my mum is in hospital. I have to be there for her, and be there for sister simultaneously. I am running to hospital 30 miles away, then home to watch sister (who is violent towards me and has left me cowering in cupboards before) then back to hospital at 8am the next day.. In November my mum was admitted suddenly, I had a planned admission that week for myself. Social work refused to help - 'You have made an active choice to help your family. As you have made that choice this is your problem to fix. Your admission is not our priority. However legally you are required to care for your sister.'
Yes , my choice, I signed a guardianship order for sister so that we could ensure she had the help she needs with medical consent etc. But for social work or treat me like that, and leave me trying to work out whether I should have my op or cancel it...
You can see that it can become a complete trap. If you don't 'care' you feel shit, and selfish. If you do, you don't have a life. Until they sort out support services I would be thinking v carefully about having a child if it was the case that you knew you would need a full time carer for most of the time.
All that said I would not change my family for the world - though I'd like my mum to have her health obviously, sister is different as her entire life is defined by autism and minus autism she wouldn't be herself.. I wouldn't say I resent my parents for having me because I love my mum to bits, best friend etc.
I just think it's something that you have to seriously consider - what support would be there etc. Same, I guess if you're having a child at an older age?
It's entirely different if you have a child and need help only some of the time, iykwim. There's less responsibility placed on the child in that circumstance.
Hope I'm not offending anyone. Just writing what I'm thinking and genuinely not meaning to cause upset if I am.