Go for the 7D! Like the others have said, go for the best camera body you can afford. Lens collection is a growing process so you can take your time with those, start with the 50mm 1.8 as your first and move from there. I recommend the 1.8 because not only is it the cheapest lens money can buy but it is also one of the most popular because it is sharper and lighter than a kit lens. Also, it will keep up with your 7 month old kid who will be moving quite a lot and you'll need a very fast lens for that (kit lenses will be slow). Trust me, my nephew was very hard to keep up because we were indoors, couldn't have too much light, didn't want to use flash and didn't want to make a lot of noise lol, you get the picture. You need a fast lens (prime).
As for zoom lenses, I have a Tokina 116 which doesn't have much zoom (11-16mm only) but it is very sharp for shooting landscape or group shots in tight spaces. The middle range, people seem to go for 17-85,15-85,18-200 etc. Forget the highly rated (and more expensive) 70-200mm lenses unless you can afford them.
Once your kid grows up and you can venture outdoors more, the zoom lenses will be fine in good lighting, the prime lenses will be even better.
