The conception of a girl child is the moment when a female embryo is formed through the fertilization of an egg by a sperm. This process typically occurs during sexual intercourse, when a man's sperm enters a woman's reproductive system and fertilizes one of her eggs. The resulting embryo will develop into a baby girl if the fertilized egg contains two X chromosomes. The conception of a girl child is a natural and beautiful process that marks the beginning of a new life.