Hi Bartłomiej,
thank you for your answer.
Yes, currently I wrote my own quick fix. It will run on $(document).ready().

$("input.form-control").each(function (index, input) { 
    var $this = $(input); 
    var $labelAndIcon = $this.siblings('label, i'); 
    var hasValue = $this.val().length; 
    var hasPlaceholder = $this.attr('placeholder'); 
    if (hasValue || hasPlaceholder) { 
            $labelAndIcon.addClass('active'); 
    }
 });

Unfortunately, this does not completely solve my problem. After field lose focus, the label overlaps the field again.

For general fix I would like prefer an initialisation method, such as exists on selects and waves-effects:

// Material Select Initialization
$('.mdb-select').materialSelect();

Waves.init();

Best regards,

Yvonne Findeis
Senior Software Engineer
Cegeka Deutschland GmbH

Currently, we don't have any quick fix for that, but what you can do is manually adding the .active class to the <label>