At a LLLL conference years ago there was a round table discussion on this very topic.  It was gently pointed out that the second child in this discussion is still a theoretical child who may or may not come into existence (secondary infertility, pregnancy loss, etc).  The question is then asked (as Jan pointed out) how much do you want to sacrifice the health and relationship of the existing child who is already here for something that may or may not happen?

As for new research CCLI engages in a lot of work in this area as well.  Heavily influence by religion, but the work on breastfeeding and fertility is generally quite good.  Last I looked they were using an average return of menses at 13 months, but I would think that range would be more useful for this mother.

Jessica Mattingly M.Ed., CCE, LLLL, IBCLC
St. Mary's Medical Center
Blue Springs, MO

CONFIDENTIALITY NOTICE:
This email message and any accompanying data or files is confidential and may contain privileged information intended only for the named recipient(s). If you are not the intended recipient(s), you are hereby notified that the dissemination, distribution, and or copying of this message is strictly prohibited. If you receive this message in error, or are not the named recipient(s), please notify the sender at the email address above, delete this email from your computer, and destroy any copies in any form immediately. Receipt by anyone other than the named recipient(s) is not a waiver of any attorney-client, work product, or other applicable privilege.
             ***********************************************

Archives: http://community.lsoft.com/archives/LACTNET.html
To reach list owners: [log in to unmask]
Mail all list management commands to: [log in to unmask]
COMMANDS:
1. To temporarily stop your subscription write in the body of an email: set lactnet nomail
2. To start it again: set lactnet mail
3. To unsubscribe: unsubscribe lactnet
4. To get a comprehensive list of rules and directions: get lactnet welcome