she just gets so fussy before we hit that time and I'm so nervous about OT that I think I end up putting her down early.
I know what you mean, when they are clearly asking for bed but you want/need them to stay awake a bit longer. Tracy advised a fan dance if that's any help
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UT naps were always more of a problem here, and for many of the sleep threads I've supported, in general people tend to fear OT more but for me it's UT that causes more of a problem (and eventually leads to OT because LO doesn't sleep long enough for the nap).
how do I know if it is too much for her? Is it based on the immediate outcome of the next nap (like yesterday's 30 minute nap?) or the accumulation of a couple of days and should keep pushing even if getting 30 minute naps?
Sometimes, if you are lucky you get an immediate positive response like a long nap, but after a few days it might shorten again which can indicate another increase is needed now they have got used to the slightly longer A. Or an immediate response may be an OT nap (short) but with more chance to re-settle (or W2S).
Either way it takes at least a few days to settle into a new routine so yes it is an accumulation and just time to get used to it.
We tend to increase A time in small increments to allow LO to settle into into and to avoid OT where possible but the danger is in going too slow, continuing to have short naps and becoming OT as a result of that instead.
FWIW Tracy shows examples in the BW books of increasing A time by 30 mins which we very rarely suggest here, usually 15 mins.
It's also worth keeping in mind LOs can learn a different habit for each nap. She may need some training to extend that first nap so she knows to sleep longer. Maybe go in at 20 mins and begin a W2S to shush/pat her through if she is likely to wake at the 30 min mark. Once she transitions continue until she's in a deep sleep, this can take up to 20 mins after transition, you may be able to do this if your older child is at school at that time or you may feel secure to leave her before the full 20 mins is up (I managed some amazing W2S in just 2 mins, literally in and out of his room but the method does suggest 20).
Hows her mood overall?