[unique_dragonfly]

In The beginning of the Mallorean, when Ce'Nedra was concerned about her fertility, Polgara was summoned to Riva and she gave Ce'Nedra a tonic made out of Oak Buds. Shortly after that Ce'Nedra seduced Garion in the forest above the Citadel, and became pregnant. Ce'Nedra didn't need the tonic when she became pregnant with Beldaran. Maybe it was the tonic that made Ce'nedra have a boy.