Laravel 5.5 - whereDay for 2 days?

Using eloquent, I am trying to get all users regardless of year who registered on February 28 OR 29 (in case of a leap year):

// If leap year, get feb 28 and 29 users
$users = \App\User::->whereMonth('created_at', '=', '02')
                    ->whereDay('created_at', '=', '28')
                    ->whereDay('created_at', '=', '29')
                    ->get();

The above does not work when we add the extra 29 check here:

->whereDay('created_at', '=', '29') // does not work because of whereDay '28' above

Ideally something like this would work, but it does not exist in the api:

->whereDayIn('created_at', ['28','29'])

Any idea how to get the users for both days February 28/29?

via Chebli Mohamed