Final answer:
The player who serves the birdy during the first inning is determined by the rules of the sport.
Step-by-step explanation:
The player who serves the birdy during the first inning of a game is determined by the rules of the specific sport. In sports such as badminton or table tennis, the player who serves the birdy is usually determined by a coin toss or by rotating turns between players. The serving player is responsible for hitting the birdy over the net and starting the gameplay.