The only sign I ever knew he was ready to transition to longer A and less sleep was when I started getting random NWs and also sometimes he stopped going to sleep by himself so easily- in hindsight he just wasn't tired enough.
That is exactly what DD is doing! Last three days all of a sudden won't go to bed by herself, random wake ups and she has been rejecting feedings here and there. Since she has booted the catnap the last two days. I think that the 3.5 EASY should be fine. Like I said - she only does 5 feedings anyway and one is right before bed and she usually blows this one off with a very small feeding. I think I may do much better with the 3.5 EASY. She gets up at 7:30 every morning so I think that my next feeding will be at 11. Although this morning we did meds and a few kisses and I didn't get to feed her until around 8. (She also did a 5am wake up so I knew she might not be hungry for the 7:30.) I am going to have to work around that a bit until I get the situation fixed... but at least I will do 3.5 for the rest of the day.
I was going to say she needs a 3.5hr EASY! With my dd it was easy (ha ha ) she was a total angel and went from 3hr to 4hr herself in the blink of an eye.
My DD1 was SO EASY (LOL) too. She would transition and then I would freak out that she was doing something wrong. Then I would read the book only to realize that she was doing exactly what she was supposed to. With her - I never read the book in much detail cause she was SO perfect. It's funny how you forget that you need to change things JUST when you get the routine right. Would you believe I FORGOT that they eventually transition to a 4 hour? I mean - did I think she was going to eat every three hours and have solid food in two months? I was excited when I remembered that they stop eating so much. She became a three month old SO fast... I really wasn't keeping up with her. the first three months is such a whirlwind!
Do you think she will handle the increase in A time or does she get OT easily?
This I am not sure of. I think that you are right... she gets more A time than I think because of the 20 min sleep that she doesn't have to go through since i am using a prop. I am not sure. This morning she was up from around 7:30 - 9. I think...

She does get OT but I don't usually have to deal with the repercussions bec. she goes into the swing. It isn't the same as trying to get an OT baby down for a nap without a prop. The prop usually handles the OT. YKWIM? Of course I was so in tune with DD1 that she never was OT. But if she was - look out. She cried at you until you put her in the bed. Forget it if you took too long to get the sleep sack on!
My next plan is to wait another week or two and then try the plan that Tracy spells out in TBWSAYP on how to get a 4 month old on EASY. DD is on EASY - her naps just are not indep. I am going to use the plan to get her off the swing. I KNOW she can indep sleep because she sleeps for 8-12 hr stretches at night. She also goes down and does some mantra stuff but goes off the sleep by herself. I have to do PU/PD cause patting annoys her. (and me). What do you think?
Thanks again.