How do you know when to transition your kid to 1 nap?

My kids' transition period was between the ages of 1.5 and 2. There are lots of ways your child may let you know his napping schedule needs tweaking. Some toddlers may take longer to nod off or become cranky when you try to put them down during the day. Others might sleep well in the morning and then resist the afternoon nap. Or your child might wake up earlier from both naps. You might also notice that when your kid misses his afternoon rest one day, he makes it to bedtime without melting down. If you see consistent changes in your toddler's sleep pattern for about two weeks, it may be time to transition to one nap.