No significant height differences were found between the California boys born in December and controls, results showed.

WSJ: Exercise in Short Bursts Is Effective

The injuries often happened when older children were playing with younger children- with significant differences in height and weight likely contributing to the severity of the falls and subsequent injuries.

FORBES: Inflatable Bouncer-Related Injuries Sharply Increase in the U.S.

Rhys Evans, the Snowdonia manager for the National Trust, said the new height was a "significant announcement" that would raise the mountain's status.

BBC: New height makes Snowdonia peak 'super mountain'