Both of my kids used Giro Scamps from the time they were old enough until ~2yrs. We also have a Nutcase kids helmet that fits really well and doesn’t move much despite the lack of adjusting ratchet in the back. The elastic seems to do nicely, along with the greater coverage of the skate-style brain bucket.
The Giro is the lighter of the two, which is preferable for when the kids invariably fall asleep and their heads flop forwards. I worry about much extra weight acting on their little necks as we bounce along on the bike.