Re: My SAHM wife is a slob!
I don't think it's unreasonable for you to expect the house to be presentable when you get home from work. Maybe not perfect, because yes - being a mom is hard work. But, laundry should be folded on a regular basis and dishes done.
I'm not a SAHM... I work full time and juggle the housework and our daughter (who is nearing 3). It's still a LOT of work. I'm sorry to say but I do not think it will get better if she goes to work, may even get worse. Unless she pitches in for more housecleaning services with her pay. I also think that if she is a very attentive mom, it may be better for the child now for her to be home with him/her.
I do think it's something you need to address kindly with her. Tell her you aren't trying to be a jerk, but the housework is a problem and you'd like to help come to some resolution. Maybe she needs to keep a chore/task list every day of things she needs to do and when. It is hard with kids, but while the child is down for a nap, or if she put a quick cartoon on - she could do some housework during the down time.
The house isn't going to look perfect at this stage, as your child is still fairly young and needs a lot of attention, but I would imagine there are a few pockets of time here and there where she could be doing more housework than what you described. She is lucky - I didn't have a housecleaner of any type, worked part time, and had NO time to myself. Sure, our house gets messy at times but eventually the mess gets picked up.
Perhaps when you come home from work you can take the baby out to the park, or do some sort of activity with him/her while your wife gets some house cleaning done?