Who took care of Naruto when he was young? In episode 350, we see that the Third Hokage took on to take care of Naruto. But towards the beginning of the anime Naruto is seen to be living alone. 

Did Naruto live with the Third? If so, why did he leave there?
Third Hokage promised Kushina, when she was dying, that he would take care of Naruto, and he did. 

Whole villagers knew that a monster fox was inside Naruto. This news also spread to the other villages. If it weren't for the astute care of the Third Hokage, other villages would have kidnapped Naruto and would have absconded him out of Konoha.

The Third may not have sheltered him at home, but he did keep an eye for Naruto. That is what taking care means. 

Besides, Iruka and others were there too. However, the main role was still played by the Third.