AF returned when DS1 was 6 months old and was still BF overnight and 6 - 8 times in 24hrs and I got preg with DS2 3 months later. First 2 months were not TTC as wanted to be able to track cycle as had taken 1 year to conceive DS1 with temping etc.
AF returned regularly for the 3 I had.

Not TTC but AF returned when DS2 was 10 months old and cycle has been 25 - 32 days.

Good luck