Our pediatrician said no real milk until our baby was 12 months old, and then she said we could do 2% at the minimum. My hubby and I also drink skim milk, so we only buy the half gallon size for our daughter because she doesn't go through it fast enough. We started giving our baby yogurt at around 14 months because she didn't really like drinking milk, and by this time she would refuse formula (about 9-12 months, she totally refused to eat any baby food). I should point out that it's really hard to find any yogurt that isn't made with skim milk and aspartame, but we have found it at Walmart (Land o'Lakes brand).
Aspartame is horrible for human consumption, so we have chosen to just cut all artificial sweeteners out of our diets. It's been especially hard to give up diet sodas and Splenda in my coffee, but we want to be healthier so we're doing it!