My DD turned 5 months this week, but is 23 weeks old (which is nearly 6 months). I occasionally give her rice or oatmeal, but am interested in starting other foods. I want to wait til she's 6 months. I feel silly asking, but is six months when she's 24 weeks old, or 6 months to the date after she was born? There seems to be a few weeks difference or I wouldn't wonder.