when does your Bub drop two sleeps and have one?

For the life of me, I can't remember when my toddler (who is now 3) dropped from 2 sleeps a day to one sleep! She sleeps from 12-2pm every day now. Her brother, who is 10 months old, is up at 6am, down again at 8.30am-10.30am but only now sleeps from about 12-12.45pm. Hmmm...he used to do the 2 x 2 hourly sleeps through the day. Any advice? They're in an awesome routine together, he goes to bed at 7pm and her around 7.15pm. Maybe my DS needs to drop the arvo sleep? I can't remember! Advice pls. Ta.

My friends little boy did it around that age but took a few months to sort himself out. He goes down round midday and for bout 2 hours

My DS dropped his at around 12 -13 months. It was messy for a couple of months while he settled into his new routine. He now sleeps for 2 - 3 hours from about midday. He goes to bed between 7 & 8 pm and wakes between 5 & 6am.

DS dropped his out completely by 14 months - and then dropped that sleep altogether just before 2.

DD1 dropped her second day sleep around 11ish months.

DD2 dropped her second day sleep at around 9ish months.

DS dropped his second day sleep at around 16 months. DD still has two day sleeps.

Ds dropped his 2nd sleep around 18 months - it went crazy for a bit where he would only sleep 45 mins during the day - now he does abou 2 hours from midday

I was thinking about dropping DD morning naps and bring back her arvo naps but she is always a train wreck by 9.30am. Some arvos she doesn't want a sleep, like today for example and other days she really needs both sleeps. I am trying to be more relaxed. If I can see that she really needs a nap then I'll put her down providing its not too late in the morning or arvo. If its too late I take her outside when possible and try to keep her from going mental.