Hi JM
An early 2-1 transition would be 9-10 mths, this is when Zstarted the transition, and really it came on quite quickly. He is spirited and high as times, and lowish SN. W see the odd 2-1 starting at 8-9 mths but it's pretty unusual and these Los tend to do a long nightshirt day ie 13 hr nights, 2.5 hr nap IYkWIM.
A short am long pm is common, and depending on the child really decides if you need to push them out and cap, or allow an UT nap as some Los won't take an UT nap (mine grr)
In the FAQs there are some info threads on 2-1
![Wink ;)](https://smiley.babywhispererforums.com/Smileys/classic/wink.gif)
have a nosy. It's a general consensus your
LO needs to able to manage 4.5 hrs A + in order to be ready for 1 nap too.
HTH