Your Clever Toddler in Week 99: Why Hide and Seek Is So Fun Now

Have fun with this newfound ability! When you're out to eat and waiting for your order, hide a penny under a napkin. Distract your child for a moment, then quickly move the penny under a cup. See if he first looks under the napkin, and then—once he discovers the penny is missing—continues to look under the table, under a plate, and finally under his cup. He'll be so delighted.

Knowing that objects continue to exist keeps us looking for missing keys, hats, or teddy bears. In fact, even for grownups, it's what makes magicians so fascinating: Although it seems they can make that rabbit disappear, we know it can't be so!

Coming soon, look forward to: Week 100: Why Possessiveness Is a Good Sign
Review the most recent accomplishments: Week 98: Understanding Different Perspectives

Curious about how else your toddler might be developing right now? Learn more about her clever brain and her growing body here:

• What's happening in Months 23 and 24?
• Here's what our pediatrician says you might be worried about around now.