I have a nest of four baby budgies. The eldest baby has hardly any flight feathers left and the smallest one in the nest has no tail feathers. The eldest is five weeks old and the smallest four weeks old. The two in the middle seem to have all their feathers. Would this be French Moult or could the mother in wanting to lay her second clutch be either pulling them out or stressing the babies to the point that the feathers are falling out? Any ideas?