How to initialize child object collection inside the class?

public class Student
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime EnrollmentDate { get; set; }

        public IList<Enrollment> Enrollments { get; set; }

        public bool IsNew
        {
            get
            {
                return this.ID == default (int);
            }
        }

        public Student
        {
            this.Enrollments= new IList<Enrollment>();
        }
    }