Taking a month off from pretty much all kinds of my regular running, hockey, gym and now cycling I actually found it hard to get back into my old routine which sounds nuts when I think of it. There is lots of good advice here but I will offer a bit from what I have seen work for others I taught. 1, Its 20 min a day to start, don't get caught up in 1 hour a day, that will come. 2, Army exercise is good but not what you need now, simple, easy and fun will get you going. Just thinking out here but if your weather is good, put the baby in the buggy and do a fast walk for minimum 20 min, when no one is looking stop and do 20 squats and get going, again drop and to some push ups or burpee's. 3, Don't start fast, the reason most feel exhausted after morning exercise instead or refreshed is because of the intensity. My morning run is slow between 10-8:30 mile pace and when I get home I go ahh that felt good not ohh I can't walk. 4, Diet if you think its bad for you it is, you know the deal..fruits, veggies, lean meats, no junk, minimal booze. Don't go on a crazy program work on one solid healthy meal a day then extend it to two but try to eat well. 5, 6 meals a day can work but its hard work, aim for non processed foods plus the good stuff, get the junk out of the house. Do those things and things will happen, 20 min a day is not much if you include the baby (been there done that, now I chase teenage boys away..I run further and faster muhhaha!) The last part is probably the most important and that is routine, if you do this for two weeks it will become routine and just be part of your day. After a bit come home put the baby down and get on the floor for another 20 min of body weight exercise. Give it time and by the summer you will be alright!