As Rosie said twice a day is overkill and will actually hinder your progress. You should be in the gym for 45min a day plus cardio.
You need to get the protein up to 1.5lbs per pound of your bodyweight. Thats a little high but you need protein to build muscle and kick start that metabolism.
I suggest a weight training regime 4-5 days a week. Abs can be done on one of those days. Crunches, leg lifts, pikes, sit ups, etc.. But as mentioned you will not be able to see the hard work you put in there unless you have a lower bodyfat level, so your diet is key here.
You can always put up a sample day of diet for us to look at. My first kids were less than 13months apart and my second a year behind that. I'm told I look like I have no kids, but I work out 5 days a week, cardio is there 3 days, and I have a diet that works for me all year and then a competition diet for shows I attend.