13 months and still no AF

[*Ash*]

Hi!
I think you are definitely within the range of normal.
I bf all my children until they were over 2. I was not taking the pill or using any form of hormone based contraception. With my first two, I got AF back when they were 13 months old.
With my third child, AF returned when he was 15 months.
I am hoping with bub #4, that AF stays away until bub is at least 15 months!

[Honeybee]

I wouldn't be concerned. I bf ds1 with formula comp feeds for 17 months, no AF. Towards the end i was only bf him to sleep and a bit at night to resettle and still no AF. AF only returned 5 weeks after I fully weaned him.

[luna moth]

I wouldn't worry. Rejoice in your ability to wear white undies any old time you like!