This was posted in the comments (hi Siuan) and I thought I would add it here. While I personally don't know that this applies to MckMama, some of the remarks on larger families with children very close in age certainly could, and are interesting.
Some women driven to ‘baby addiction’
Also, I have been sent confirmation from several sources that an organization focusing on family has decided to no longer partner with MckMama, as some of her personal issues and statements on her blog do not match up with their beliefs and mission. They have said that they will continue to minister to the family and offer encouragement when needed, though.
One last thing. MckMama posted a bunch of quotes that are "speaking to her lately" yesterday. Anyone else think she's "not responding to naysayers" again?