There really is no one size fits all answer when it comes to bonding. Every rabbit is different, every situation is different. I haven't always followed the usual recommendations as my circumstances have sometimes required that I do things differently, such as having an unspayed female with a neutered male for a while. But if you do vary from the usual recommendation of waiting til both rabbits are adults and fixed, you just need to be very educated about bonding and rabbit behavior, and be aware that this poses risks of ruining potential bonds, fights breaking out, and very serious injuries occurring. Not that it will happen, but these things are certainly possibilities. Plus there is also the possibility that even if you did wait to bond til the baby was mature and spayed, there is no guarantee that they will bond at that point. Essentially it really comes down to the individual rabbits personalities.
I'm not going to say whether or not you should keep them together or separated at this point. I know of others that have had a baby with an adult until it was old enough to get fixed, and had no problems, and I even had to put a baby with an adult for a time out of necessity. But if it is something you are considering, just know that there is always some risk to doing it, especially for the baby, which risk can include serious injury or even possible fatality. So it's not a decision to make without very careful consideration. The one good thing is that you have already got past the initial introduction and your adult female seems to be fine with the new baby, for now at least. That can change, but then it can also happen with two adult fixed rabbits that have been bonded for a while, who can fall out, fight, and the bond is broken. If you do decide to keep them together, just be aware that as the baby reaches about 3-6 months old, when the hormones start coming in, that is usually the time when there can start to be issues and possible fighting. Won't always happen, but it can and needs to be closely monitored.
Like I said, no one size fits all. Bonding is just complicated. A lot of the time I've just had to go with my gut on which direction to take.