You need to demonstrate to first time visitors that your blog is updated all the time, so they feel that if they come back they will find something new. This causes them to bookmark or subscribe to your blog.
Once you get traction you still need to keep the fresh content coming, but your loyal audience will be more forgiving if you slow down your publication schedule. The first few months are important because your blog starts off empty. The more content you can produce at this time the better.