I find it interesting how negatively this is viewed here. My gut feeling says that even now with the 4.9k in parental leave (5.6k before parental leave), a 450k financing with a rate of 1.8k seems manageable to me. Yes, of course, the rate would have been significantly smaller 1.5 years ago, but my impression is that this is still within a healthy range. There are a few items in the household budget that, as mentioned, I would take another look at (they can also be personal, presumably mostly consumption expenses), but overall it seems to fit.
I also noticed that the construction costs don't quite add up yet. It says 121k for the plot of land (land transfer tax and co not forgotten?), 380k for the house, 20-30k for incidental construction costs, and the total then is 500k. (Have the incidental construction costs decreased again here or were they already included in the house costs from the beginning?). I just wanted to point out again not to forget about taxes/notary fees, etc. If the property is bought from the developer, these also add to the total amount, and the 9-12% or whatever it is is not an insignificant sum (if plot/house are separate, then less significant).
Regarding general consumption and children’s costs, my feeling is always that people just spend what they have. Those who have more generally spend more (often without feeling wasteful). But that doesn't necessarily mean it can't be done differently at all. (Although I still don't get the impression that the original poster here should be overly worried... Maybe I'm just a poor church mouse after all).