Great job.

You could in theory keep losing fat and gaining muscle and other aspects of improved fitness (greater bone density, more blood volume in more blood vessels, more water with more stored carbs in muscles, ect).
At some point your current eating level will be at a deficit to what the body with more LBM is actually burning, and you will very slowly start losing weight as fat.

Usually those gains are spread out over whole body, while the loss in fat is localized, easier to measure and notice.

But they also slow down as you become more fit.

So you are eating at maintenance right now, TDEE.

If a healthy weight is still needed though by losing more fat, it would be better while starting resistance training to try to lose more fat and weight at the same time.

Because only at the start can you do both, later you won't get that and you'll be forced to do a slow method of recomp - slower than you are seeing now because the body will already be trained.

So not sure if you are at a reset right now, or have attempted to go in to a purposeful deficit.
If the latter - you don't have it yet.

Depending on amount to lose, I agree scale should not be the whole or maybe not even big part of the picture.

But if a decent amount to lose to be healthy weight range, then it actually does matter for other reasons besides feeling strong and looking thinner.
Besides - if you can have reasonable actual deficit and lose more fat weight, why not.

Not to derail your question... Muscle is more dense so you can lose inches and gain weight. Do a google image search of "heavier but leaner"

I have never lost inches without losing weight, however, I have lost 3 lbs that looked like 5 or 10 lbs because of weight lifting and working out 4-5 days a week. I also find that changing my calories based on my activity makes a huge difference. I eat more on days I'm more active, eat less on more sedentary days.

When I think of density, I always compare.... like lead the size of a brick and styrofoam the size of balloon. The lead brick is smaller yet much heavier than the balloon shaped styrofoam. So yeah, the lead brick (muscle) is more dense than the styrofoam (fat). Smaller yet heavier. I know you get that now, but just in case anyone else is reading this. I like visuals for explanations. Makes things simpler for me to get it. My weight has recently gone up and inches have gone down. So, I don't know. I've been trying to figure that all out myself. My pants have also gotten tighter... so I don't know where that fits in the equation!

I think weight loss after having a baby can be so challenging. I've never done it myself, but I've worked with babies and new mothers a lot in my career. It can be a lot balance sanity of mind, taking care of a new baby as well as dealing with all of the changes in your body. I hope you have some new mom friends to talk with all of that stuff about too. Sometimes society pushes people to be super moms. They push that you should be able to lose all the weight you gained, while simultaneously keeping the house clean, preparing every meal, being joyful every second AND you should still be able to squeeze in time for yourself with your girlfriends. The only mothers I have seen that can manage this have hired help. Like the CEO of Yahoo! went back to work a week after giving birth... but she had nursery built next to her office and had a full-time nanny come into to take care of the baby. It's all a big pet peeve of mine and sets up unrealistic expectations on women and leads women to feeling like failure if they aren't enjoying motherhood every second.

All sorts of things happen to your body after having a baby that can make exercise in general more difficult. I have a physical therapist that works on my SI joint and chronic pelvic floor pain (vulvodynia) and most of her clientele are post-partum moms.

Anyway, good on you for trying to get health while having a baby! None of these things may apply to you. Just in case some other new mom is reading and it applies to her, I haven't posted yet about this topic on the EM2WL forums. I think you deserve a big pat on the back for starting to work on your health and recognition that it's not as easy as the media and the internet make it out to be.

If I were you, I'd add some more strength training into your cardio. I just don't see dropping below 1700 having any benefit to you energy wise. Someone else started a thread called "strength training for the super weak" and there are some good tips there. I started out pretty weak with strength training too back in August, and I'm getting pretty strong now. I wish I had some advice on your calories, but I don't really. I'm still trying to figure that out myself. If your TDEE is 2400-2700 per day, 1800 per day is a 600-900 calories per day deficit which is big. Seems like the scale would be going down at least some so I'm a little lost on that too. Unless its possible to suppress your metabolism that quickly, after two months of eating 1700 calories a day? Doesn't seem likely but I don't understand it all enough. I don't know.

I'm sorry no great answer has been really given, but I hope you appreciate the place you're in and take full advantage. Also, I want to congratulate you on being a mom with 2 little ones that still makes time to workout 6 days/wk! That's awesome dedication and I'm certain you're on your way to achieving all of your goals!! You're an inspiration!