How much sleep they need: 10 to 13 hours, including naps, if applicable.
Once your toddler is attending some kind of nursery school, preschool, or daycare regularly, getting them into a routine with sleep becomes more important than ever. Many kids in this age range are still taking daily naps, so ensuring that their naps and night's sleep are at least 10 hours total (and that their naps fit well into the day so as not to ruin their nightly sleep or daytime activities) is important for their development. And if you can't get your toddler — who is now in a big kid bed they can likely get into and out of themselves — to sleep without waking through the night, Dr. Harvey Karp has a great tip to help train them to sleep and self-soothe better.