I am not a photographer but I am in the design industry and commission photography as part of my day job. I also hired a newborn photographer to do a shoot when my son was born.
I think you are vastly underestimating how much equipment and capital you need to get set up properly. It's not just about having a good camera. Newborns are generally shot inside, either in some kind of studio set up or at the parents home. The lady who shot my son had a mobile set up that she assembled in my living room.
This included: Various backgrounds being held up by a large frame, lights, reflectors, her camera, a tripod, flash, a large bean bag covered in about 5 blankets to position baby safely, shusher to keep baby asleep. Many many props including, buckets, baskets, different outfits and toys. A fan heater blowing warm air so baby wouldn't get cold during the shoot.
Remember babies and children are notoriously unpredictable and unreliable. You might have a baby who screams through the whole shoot or pees / poops on your props. The lady who shot my son was basically a baby whisperer; she spent the first 15 minutes just cuddling him with the fan on and the shusher just to get him as relaxed as possible.
I'm not saying don't do it. Just that there is a lot more involved than you realise.
You mentioned there is a really expensive newborn photographer in your area who is really good. My advise would be to contact them and ask if you can work as an unpaid assistant on some shoots. This will give you more understanding of what is actually involved.
I also echo previous posters who have said that you should not quit your day job. You need to build up your skills first. Photography is part art and part science, mastering the lighting side of things is a huge deal and is Photoshop. In fact it is likely you will spend as much time editing images as shooting them.
Good luck with whatever you decide.