I don’t think it takes intricate knowledge of employment statistics to know that part time school hour jobs are not easy to find and also tend to be poorly paid.
I have found this thread a very uncomfortable read.
Approaching your fourth decade single and childless (when this is not what you would personally have wished for) can be distressing in the extreme.
The OP is not being particularly selfish as far as I can see.
My understanding is that at present her job is well paid but this is offset with anti social hours in an expensive part of the country, where she is renting a property. She recognises - probably correctly - that she would not be able to afford rent, childcare and bills. If she went back to work and had to pay for those she would find herself on less than 450 a month. I know because I earn a similar amount and after pension contributions and tax and NI I get 2400 in my bank account. Rent in an expensive part of the country can easily be £1000 a month. Easily. Childcare the same. Leaving £400 for council tax, nappies, clothes, food, petrol/train/bus fares, broadband. This is approximate of course. The rent could easily be more or less. The point is still that very little would be left over.
The op recognises this is not tenable so has considered her options and will be moving into a property she owns outright and live off a small amount of CB plus the income from a second property. This totals around £500 a month which has to pay for council tax, electricity, phone and food nappies and clothes HOWEVER the two huge costs - rent and childcare - are reduced to nil.
That seems pragmatic enough to me. It is very tight indeed but OP says she can do some freelance work which would up her income level but that she is not relying on it - again, I see that as sensible. I am similar and work on a minimum amount and then anything extra is a bonus.
I think that having a baby is hard, I have done it. I also think it is selfish. I have done it, I may yet do it again, that is for me, the planet doesn’t need my children. I do not think it is as hard as posters claim. I do think and I will risk a flaming this is where your life thus far and expectations come into it. I have friends who have led really rather pampered lives - school and university and a backdrop of a loving home and supportive mum and dad and nice job and nice boyfriend who became a nice husband and nice mortgage and then WHAM a baby and the baby cries and they can’t go out as easily with the nice friend and the nice job is that bit harder.
For me I didn’t have the loving home and I didn’t have the nice boyfriend and I didn’t have the nice job for a long time. To be honest I found having a puppy loads harder than babies. Mainly because you can take kids to places that won’t allow dogs. But that is by the by, that is my personal view and I have no wish to dismiss anybody else’s. However I do feel as the OP did that there is a hint of smugness in some of the posts.
In short I don’t think op is doing anything drastically different to anybody sensible before they have a child - looking at her life and seeing where and how a child would fit into it.