trifle
I am not suggesting you have a problem with people with disabilities, but disablism is more subtle than that. People with disabilities are at an inherent disadvantage, in the case of a wheelchair user because they cannot walk due to their physical disability.
For that reason, it is discrimination against a person with a disability not to make a reasonable adjustment to remove that disadvantage. In other words, disablism isn't just about not having a problem with disabled people or not being mean to them, it's about failing to take reasonable steps to remove the disadvantage that they are at as compared with someone without that disability.
The fact that you have a new baby like billions of women before you does not put you at a disadvantage in society. I'm sorry, but it doesn't. You cannot compare having a baby to having to use a wheelchair to get around. The comparison is insulting. Their need is infinitely greater than yours.
And even though it sounds great to say a wheelchair user will have priority, read kitkats earlier posts. Even with that priority, and even if it is respected by parents onboard, wheelchair users are often treated as a burden in a way which you with your child cannot even begin to imagine.
I know you've taken a lot of flack on here, not least from me, so I've tried to calmly set out why I say you're enabling disability discrimination. Please don't get defensive, please think about it, and please no matter what do not think your "need" for the wheelchair space is anything like as great as the wheelchair users. Please give it up in future.