Hi Fleur - all already said everything so just popping with some small support.
Agree with the ladies that sleep needs drop that age, but my general advice would be:
- going towards set times rather then A time; mainly to stress less... I have to tell you that I was more stressed with EWU as thinking how the day will go after 5:30 WU and how tired F will be, what time the nap should be etc; now if he wakes earlier, I just say to myself "fine, your choice... not to sleep, but the nap is at 12"
- we are doing nap at 12 but F is in the nursery 5 days a week and really tired so different story; I read that when they get older moving nap is important to prevent EWU but general sleep needs are not changing... ykwim? so you just move the nap, making morning A longer, but keeping afternoon A shorter; they just need A blocked in one longer slot
- stuck to a routine; we already went through different stages of 1-2 weeks of fuffing at BT or unhappy WU but I just stick to the routine and it passes
- are you BF before or after bath in the evening? it's worth moving it 30min before settling so for them no to join these two moments.
hth