SweetSpot will sometimes recommend an extra nap beyond the number you’ve set. This can happen if your child will be ready to sleep significantly before the bedtime you’ve saved in the Child Profile settings (so it’s not just an early bedtime).
Any time your child is expected to be sleepy during the times you’ve marked as “day sleep” will be labeled a “nap.” If an extra nap is suggested frequently, it might be that your day-end time (bedtime) should be moved earlier. You can review and change your day-end time on the Child Profile page.