How do you know when your child only needs one nap a day?

How do you know when your baby is ready to switch to 1 nap a day? My first napped 2 times a day until 18 months. My second just turned 1 so just curious on your opinions!

All three of mine were around 14mo

My son started napping 1x a day at 8 or 9 months. He’s almost 15 months now. I just followed his ques.

When both naps get shorter and having a harder time going down each time

My daughter has been taking one nap a day since 11 months. She takes a good nap an hour or longer. She also sleeps 9-12 hours a night as well.

When it’s harder and if they do get 2 they don’t sleep good at night…you’ll notice lol

Since around 1yo my daughter started napping once daily. Routine is always better for kids if you can help it. She lays down everyday at 12:30 and sleeps 2-3hrs and then goes back to bed between 7:30-8pm and sleeps until 7:30/8am every day!