The phrase "first several weeks" is grammatically correct and can be used in written English.
For example: During the first several weeks of the new school year, I had difficulty keeping up with my classmates.
For the first several weeks, the protesters did little more than sit around and chat.
During the course of the first several weeks in the army, he will also receive three inoculations for tetanus.
Schumer praised Pelosi's leadership throughout the month-long saga that consumed the first several weeks of her speakership.
Color intensity was also strongly associated with a likelihood that the fledgling would survive the first several weeks.
Janene Fuerch, MD, clinical assistant professor of neonatology at Stanford, was one of the neonatal intensive care unit fellows during Dane's first several weeks at Packard Children's.
In the first several weeks of a pregnancy, a miscarriage sometimes happens because a fertilized egg did not properly form a fetus.
After the first several weeks of uncertainty, most of the news about the 2009 H1N1 "swine flu" pandemic has been reassuring.
Hypertrophic pyloric stenosis (HPS) is a condition noted within the first several weeks of life that results in hypertrophy of the pyloric muscle between the stomach and duodenum.
However, primary failure of native fistula occurs because of either thrombosis formation within the first several weeks after surgery or immature vein dilatation.
Her first several weeks on the trial were rough, with an early hospitalization after she cut back too quickly on her fentanyl and went into withdrawal.
For the first several weeks, with the police making no progress on the case, as Capote himself said later: "Nothing happened.
