Generally for a 1yo the morning A time is about 3-3.5hrs... some do more. In the afternoon.. b/n naps its about 3.5hrs (some do more & some less) & before bedtime about 3.5-4hrs (again some do more). So if nights are good & they are sleeping through then I think you should leave things as they are
A morning nap can be as late as 12pm (just all depends on the wake up time
).. so for a baby that starts their day around 7-7.30am the morning nap can be around from 10-11am. An afternoon nap can be as late as 4-4.30pm for a 7.30/8pm bedtime. If you want to maintain bedtime of 7pm then I would probably not let them sleep past 4pm.
So if you see that the afternoon nap is being pushed too far into the afternoon, bedtime is being pushed too far as well or that they are starting to wake earlier in the day then you could try shortening the morning nap to 1hr, offer the afternoon nap earlier & then bedtime should go back to 7pm
In general when they are down to 1 nap... you schedule will be 7-7.30am wake; 12-12.30pm - afternoon nap (1.5-2hrs long); 7/7.30pm - bedtime
hth
Layla
Your babies are soooo adorable!!!