Karen,
The unofficial record for lactational amenorrhea (no periods) is over 3 years.
This mom was breastfeeding twins who were highly allergic to almost
everything (given formula as preemies..)so she was providing a good deal of
their nutrition. I have heard moms go much more than one year nursing one
child. There is a wide range of normal here. As long as there are no
untoward symptoms, mom should relax and enjoy.
Catherine Watson Genna, IBCLC NYC