I didnt believe it so i imdb it (my movie god) and its not true. Baby Harry from movie 1 is played by the saunders triplets and young albus severus is played by arthur bowen.
25 Magical Facts about Harry Potter Books and Movies
1. The actor (Hero Fiennes-Tiffin) who played 11-year-old Voldemort (also known as Tom Riddle) in "Harry Potter and the Half-Blood Prince" is the nephew of Ralph Fiennes, the actor who played the grown-up Voldemort in the final 5 films. 2. Voldemort was 71 years old when he died in Harry Potter.