17 month old dropping his naps

Raquel

My 17 m son dropped his second nap months ago. He now takes 1 nap and lately it’s only 20 minutes, half hour tops! I thought it was just a phase at first and he’d go back to napping 1-2 hours but that hasn’t happen. Could this be him phasing out his naps altogether? Or do u think this is just a phase?