Peta Murgatroyd’s Son Rio Just Turned 1 & Clearly Isn’t Happy With the ‘Pizza Challenge'

In the age of social media, every little milestone — for better or worse — is captured with a photo or video. And so parents have found special ways to celebrate their kids’ first and last days of school (maybe with a homemade sign or one from Etsy) or to give their holiday photos an extra dose of cuteness (matching pajamas, anyone?!).

And perhaps most common of all are the special ways parents mark their infants’ monthly milestones (1 month old, 2 months old, etc.). Some parents...