If your once great sleeper suddenly starts becoming not so great, then it's time to start considering if maybe it's time to drop one of their naps. Here are 3 ways to know if your baby is ready to drop a nap: • It takes your baby more than 15 to 20 minutes to fall sleep • Longer naps are no longer happening • They are refusing naps completely. If you see any of these signs happening for a few days or more, it may mean your child is at the age that they are ready to drop a nap.