A 2-year-old is lying on the floor yelling, with their socks pulled off after spending 15 minutes trying to get them on in the first place. A caregiver might take a deep breath and think, "Here we go again—another 'terrible twos' tantrum.
Source: [Phys.org](https://phys.org/news/2026-07-terrible-twoyearolds-independent.html)