Yes, it is true. For me we tried to 3.5 years for #1, I have PCOS, and my DH has a very low sperm count, we were told we would never get pregnant without intervention. We had #1, I nursed him, had my first PPAF when my DS was 9 months old. Got pregnant 5 months later, we weren't really actively trying either, that pregnancy ended in mc, got pregnant for a third time the next month, had my second DS. Now between #3 and #4, it took about a year, but that was due to DH meds, as soon as he stopped them, we became pregnant with my DD. I had my first PPAF when my ODD was 12 months old, became pregnant 3 months later. I resumed my PPAF with my YDD at again 12 months old, had one PPAF and was pregnant with the baby I just mc. I am sure we will be pregnant soon.
So
#1-3.5 years
#2-5 months (mc)
#3-1 month
#4-1+ year (anamoly)
#5-3 months
#6-1 month (mc)