Hey Linda,
I'm pretty much just going to repeat what the others have said. It just kind of "happened" when Gabby dropped one of her sleeps.
She used to be up for 2 hours, down for 2 hours - so she was on 3 naps a day.
Now she is similar to Eliza (Bec G's little girl). She generally has a sleep at 10am and 2pm (give or take).
I remember wondering and wishing for a 2 sleep routine when Gabby was younger... now I am doing the same with wanting just 1 nap! LOL I'm never content...