CREATE TABLE table_204_769 (id DECIMAL, "full name" TEXT, "nickname" TEXT, "gender" TEXT, "weight at birth" TEXT, "meaning" TEXT)

who weighed the most ?
SELECT "nickname" FROM table_204_769 ORDER BY "weight at birth" DESC LIMIT 1
SELECT "nickname" FROM "table_204_769" ORDER BY "weight at birth" DESC NULLS LAST LIMIT 1