My almost 19 week old still keeps clenched fists. She's been grabbing and holding onto things as well as holding her own bottle for a long time now, but I'm still concerned that she's still clenching a lot during Tummy Time (though she can push herself up fine and do a mini push up) and in the bath her arms are half raised and in fists. I figured by now they wouldnt be clenched as much. I just saw my a pic of my friends baby who is the same age and in every pic her hands are wide open. Am I worrying for nothing?