Brood is collective term for the developmental stages of eggs, larva and pupa. The normal worker egg is deposited by a queen in an empty cell of the brood area. The egg transitions (bee eggs do not "hatch") to the larva in approximately 3 days (in the controlled temeprature atmosphere of the bee hive). One egg per cell, centered at the bottom of the cell is normal; sometimes a new queen will place two eggs in a cell.
Eggs must be fertilized as they leave the body of the queen to become workers. Unfertilized eggs are not fertilized and are placed in larger drone-sized comb cells. Incorrect egg type relative to cell size or if there are multiple eggs placed haphazaradly within a cell will be removed by workers. Worker bees "police" the brood area and remove diploid eggs of workers with developed ovaries and "abnormal" eggs of the queen.
The second brood stage is the larva (plural larvae).
https://www.youtube.com/watch?v=yrZcBk6xKtU
https://www.buzzaboutbees.net/honey-bee-life-cycle.html
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