It is up to you. If you belive in him he is real if you don't he is not. If you belive in him he brings you your x-mas presents if you don't your mum/dad does.
Santa was born and from that second on, he started gaining wait! So much in fact, the only clothes he could wear was a big red robe, red baggy pants, and big black boots. Hats didn' POO! t fit him...