2 nap transistion? anyone else?

Liam is 6 months 10 days old.

he was taking 3 naps a day.

ROUGHLY around:

9am (45 minutes to -1.5hours)

1pm to 3:00pm. (2hrs) without fail.

and then again in the evening at 5 or so. (20-50 min)

so total nap time (avg) would be like 4 - 4½ hours.

and then bedtime around 8pm, and sleeps about 11 hours.

*******HOWEVER ******

In the last 10 days or so we been doing 2 naps some days, and some days 3.

when he has 2 nap days he usually is waking up in the morning around 8am. then goes down for a nap around 11am. hell sleep 1.5 - 2 hrs. sometimes 2hr 20 minutes.

hell wake around 1ish. and and have another nap around 4pm. which lasts 1.5 hours or so. sometimes longer, but i want him up by 6pm for his 7:45/8pm bedtime.

so it seems he's dropped down to 2 naps but they often are the same length in time and are longer naps.

we never tried to push his wake time to 3 hours, but he seems to be doing ok with it. sometimes its 4 hours depending.

anyone else's little one doing 2 naps on some days?

if so, what time do they nap? has bedtime stayed the same?