I think honestly, you have to look at the long term here. As many have pointed out in the thread, what does life look like in 3, 5, 10 years from now.
Your baby is only 9 months old. I don’t mean this condescendingly but you have not experienced the banality of life every single day with very young children. For some, every single day is joyous. For others, it’s hell on earth. For a large portion of parents, it’s fine most days but there’s a sense of every day being the same - park, toddler group, lunch, activities at home. Day in, day out of the same is hard. It’s not terrible but it can get to you.
Add in other people’s children - you’ve no idea if you even like being around children. You can objectively like lots of children, but being with them all day, every day, is not the same as imagining an idyllic scene of toddlers gambolling across a park and splashing in puddles. There are lots of moments of joy; there are also lots of moment of low level boredom and frustration with dealing with the millionth problem or tantrum.
I have three and my youngest is 4. When I had my first, I felt very similar to you. I even came close to doing it and arranging to look after the child of a woman in my NCT class. We both had visions of idyllic days spent with me looking after her daughter whilst she went back to work. It would have been a terrible idea. I found the drudgery of days with my own toddler not always easy to deal with. I made a lot of mum friends who kept me sane because I was bored and frustrated but loved being my children. I did actually end up quitting my corporate role but kept my hand in by freelancing, because I was terrified of becoming unemployable. Now my youngest has been through pre school and is now in Reception, I have a very highly paying, highly rewarding role in my career again.
I’m not saying everyone finds the long days with children hard. Some wonderful people love each and every day. I adore my children and day to day it was ok but long term, I struggled. Emotionally and mentally. I am not saying you will struggle or won’t - the point is, you don’t know. Life with toddlers and young children is hard work. You’ve no idea if you even LIKE being around young children. You wanted to be a teacher but again - you’ve not experienced it to know what it’s like.
I would probably wait until your own child is coming up to 2 years before making a decision like this, just so you have some experience of life with young children. Then make the decision because of what you WANT, not what you don’t want.