The 18-month-old boy, who was kidnapped allegedly by a domestic help from his Delhi home three days ago, has been rescued by the police. Four persons including two women were arrested; one of the two women arrested is the maid. Police said, the boy was rescued from Faridabad, near Badarpur border around midnight. According to Delhi Police, 551 children have gone missing from the capital this year, with this month alone accounting for 176 such cases.