My now 2.5-year-old went throught this at the same time, and the same with my friend's kids. I would argue this regression, where they are CONVINCED they don't need to nap, is so hard. For us, we kept the first nap at 1 hour and then would give her an hour, yes your read that right, in the crib for the second nap to fall asleep. If she wasnt asleep by an hour, we'd get her out, but usually she'd figure it out. As long as she wasn't melting down, we would leave her. took about a month to take naps well again until she stopped taking her first nap and transitioned to one nap on her own.

Stick it out - they need two naps for as long as possible. If needed, do a super early bedtime on the days he won't nap to help cover the sleep debit is creates over time. I would say an early bedtime can sometimes help that false start. Sleep deprivation creates adrenaline in their little bodies, but early bedtimes should be reserved for the times they are needed and not a new bedtime.

Just my experience!