I am not sure how true this is but I wa sjust messing around and found this little article about being able to have multiples while breastfeeding...
Most people think that you can't get pregnant while breastfeeding, that the process of lactating keeps a woman from ovulating. However, plenty of mothers of twins can disprove that theory. Some research has supported the theory that the chance of twins or multiples is increased if a woman conceives while breastfeeding..
"I have 4 year old identical twin girls I fell prgnant with them when my first daughter was 6 months old ... I was still breastfeeding her! I had no idea until now there was any link between breastfeeding and twin pregnancies. Like you suggest I was one of those under the impression that pregnancy is unlikely to occur whilst breastfeeding!!" -- Sarah"
If you would like to read the site here is the link
http://multiples.about.com/od/funfac...ohavetwins.htm