What losses did Leontes suffer immediately after the trial?

In Act III, scene ii, Leontes remains as stubborn and angry as ever at the trial, attacking and threatening Hermione while she counters him eloquently. An officer breaks the seal on the message from the oracle and reads: Hermione, Polixenes, and Camillo are innocent and Leontes is a jealous tyrant. The oracle also predicts that Leontes will be without an heir unless the lost daughter is found. The court is delighted, but Leontes denounces the words of the oracle as false. But then a servant enters, bringing terrible news: Prince Mamillius is dead, killed by anxiety about his mother's fate. Leontes believes that the gods have killed the child as punishment to the king, and finally he realizes that he has been in error.