Over my years working with that age I have found that unless the baby sleeps 12 hours at night and at least 3 hours at the one nap then they are NOT ready for it.
Think of it this way, naps for kids are like oil changes. They need them to run correctly, to process the information they encounter and to have the energy to deal with life and grow. Like your car you can't tell right away that a missed oil change is a bad thing. But one day the car will just die on you. For kids it's one day they will just not be as smart, they won't behave as good, they won't retain information as good.
Yes they can survive on less sleep, but they don't thrive on less sleep.
I have NEVER in all my years met a child that did well on only one nap prior to 15 mos old. Most kids that wake up before 8 a.m. need at least two naps until they are over 18 mos old unless they are getting 13 hours of uninterrupted night time sleep.