hiya. I'd say the EW is due to 2 things:
- they are probably getting to the stage where they don't need that late afternoon nap anymore
- the morning nap starts a wee bit too early. Early waking is strongly linked to too long & too early a morning nap & at this age an hour should be ok but I think it needs to start nearer to 9am.
IIWY I would try & very gently push the morning nap later, do it 5mins later every 3 days (to prevent overtiredness) until it starts at 9am. I would still limit it to an hour, and at the same time push the lunchtime nap 5mins later every 3 days until it starts at 12.30pm. By pushing both naps a touch later you might find they can manage without that late afternoon nap, perhaps with a slightly earlier bedtime for a wee while until they get used to it.
If they are still only napping for 1.5hrs at their lunchtime nap, they may struggle to last all the way to 7pm, so you might then consider nudging the LTN slightly later (again slowly by 5mins every 3 days) towards a 1pm start & see if that gets you a 2hr nap, then your routine will hopefully look something like this:
Up: 6.30-7am
Nap: 9-10am
Nap: 1-3pm
BT: 7pm
Once you are here, if EW continues or the lunchtime nap stays 1.5hrs then you may need to cut the morning nap slightly shorter 5 mins at a time by starting it 5mins later but still waking them at 10am, til nap is 45mins, or 30mins if necessary. If you do this, LTN may need to come slightly earlier again, back to 12.30pm.
HTH.x