I'm a working mom and I *don't* do it all. I just try for some things. For instance, my house is not clean. It is full of clutter. But I do insist upon cleaning the toilets once a week and vacumming (all done on Saturday). My house is fairly clean for one day a week.
The one thing I do insist upon is a nice dinner meal for my family. That is just my priority. So I cook every night just about. But that is all I do. I come home at 4:00, start cooking. By the time we eat and clean up it is usually 5:30. From there, I do try to do some laundry or just unwind a bit. I definitely don't clean the house.
My kids are older now (12 and 9) so I don't have as much that needs to be done *to* them. But I remember those days of coming home, make the next day's bottles, bathing the baby, etc., etc., etc. It is very exhausting. Don't sweat it. Once the baby is moving around and entertaining himself, you will have some "hands-free" time. The best thing I ever got was one of those bouncing things. My son loved it. He would bounce, I would cook.