hi there.
so, your Lo is 6 months, right?
at 6 months some babies still need their catnap, some start dropping it. my dd started dropping her catnap at some 6,5 mos, which wasn't that easy for us as she was just pretty annoying in the evenings and had to go to bed really early, but finally at 7,5 mos she was down to 2 naps a day.
you still have plenty of time before your Lo will be ready for just one nap a day. it usually doesn't happen until they're at least one year old [may happen earlier but not at 6 months thou].
maybe you could post your routine and we would try to solve whatever problems with naps you're having?
HTH
Monika