Given Joel's history, I'm inclined to believe that the time he posted about going to the store with Mabel and now that he let Carrie sleep in and took care of Mabel is the first time he did any of those things. He hasn't posted much about spending time with his newborn in weeks, and now suddenly he's posting all the mundane stuff. Why now if it's supposedly such a casual occurrence? He is exactly the type of person to document and post about anything that happens for the first time. I'm convinced he hasn't been around to help Carrie at all.