Wow lots of replies, it's taken me some time to read through them. Thanks everyone.
It's cropped up a few times what my partner's thoughts would be - to be honest he wouldn't be happy as my salary is the bulk of our income. He earns around 10-15k less than me, dependant on overtime. It would be a huge cut in our finances. We'd probably have to downsize our home, which would be a shame as it's quite a large house with lots of space (ideal for childminding - but would probably no longer be affordable without my salary). I also hadn't even thought of the need for a 7 seater car! Very good point.
I do like children and helping them to learn and develop - but I hadn't thought about the dynamic of caring for my own alongside a house full of other people's. I imagine it would feel very difficult as others have pointed out, to feel constantly torn in wanting to provide for my own child but having to split that time and attention. She's 9 months at the moment so probably less of an issue, but when she's a bit older and heading into the terrible 2s, she might find it hard to share her mummy. I hadn't even considered that - I was just picturing idyllic scenes of painting and days out with her and other children. I also hadn't realised that it was off putting to other parents to consider a CM who also cares for their own child, but I can understand why. I think I'd feel similarly, and worry that my own child's need would always come second...
Someone also pointed out that you wake up in your work place, spend all day there and go to bed there too. This sounds appealing at the moment because I'm struggling with leaving my baby and just want to snuggle up at home with her. But maybe this will become wearing, when I'm struggling to draw boundaries between my home and work life.
I also currently get paid holidays and sick days, and a very good pension, which I'd be giving up.
It seems like the sensible compromise is to reduce hours in my current job. I plan to submit a request to my manager for reduced hours (4 days a week). Hopefully he will consider this! I think my workload could be managed on 4 days a week if I was sensible with planning etc.
Thank you all. Lots of food for thought!