I would never speculate about whether they want children but I'm sure Anna has said she does a few times. If they do have a baby, given how Anna and Mark seem quite principled, I can't imagine they would want to expose said child on the Internet and exploit them for brand deals. But then if Mark is now working with/for her, it doesn't seem that they have any near plans to quit influencing if all of their income is dependent on Anna's job.