My goslings are 4, 5 months old. The breeder said that they were male and female just visually sexing them according to their size difference. The white gosling was the biggest of the clutch and the brown one the smallest of all. Now the brown one is the same size if not bigger. Can anyone please help on sexing them? Also could the white gosling be a hybrid? There was only one african/chinese male and 5 african/chinese geese as well as a "common" goose. Could it be a mix? He seems to have started developing the lump on his forehead though. Thanks!