Hi and welcome to the forums
It sounds like you've made amazing progress so far, go you. It's really helpful when the dad's are on the same page too!
Ok, first off I think you're probably trying for a nap too early hun. I think she's protesting about being asked to go to sleep when she's not quite ready. 1.5hr A would be really an A time suitable for a 3mo
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The book does say to watch out for cues, and what you're doing is great by watching her. This actually is really only suitable for the early days. Later on, not only to we have to watch them, we have to keep one eye on the clock too. They start showing tired cues if they're hungry or bored around now just to confuse us! They start to want to extend their A time so much from 4-8mths of age it is just crazy and hard for them to keep up, so we have to help them a little too.
I think we should start at a minimum of 2hrs 15mins. Wdyt? If you see this link here the A time can go up an hour in a month
Average A times- BOOKMARK ME! Your wind down routine is perfect, and consistent, definitely have nothing to say about that. I would continue as you have been there, but perhaps just start it a little later? Maybe do the top up feed a little earlier, then start your wind-down routine? Do you want to try and perhaps keep me posted and we can take it from there?
We tend to work with just the first nap of the day to start with, but you'll probably find all the A times need to be somewhere nearer that point than 1.5hrs ok? Here to hold your hand. You've come so far already, I'm sure just a few minor tweaks and we'll have it sorted for you... Well until the next thing obviously
xx