“Fans may remember she once dubbed her 'mum fringe', after she debuted the style following the birth of Princess Charlotte," per Hello! This time around, it's a little more subtle—which may be because the Duchess was reported to be a little unsure about the haircut when she first trialled it back in 2015. Since then, she's experimented with a number of styles, but she does appear to prefer some shorter lengths to frame her face."
For context, here’s Kate with far longer locks and loose waves during a SportsAid Stars event on Feb 25th.
Here she is with her “mum fringe” circa 2015.
And here she is today.
Clearly, the woman can do no wrong!