I was so delighted that my 5 week old grasped a plastic rattle this morning that I put another, a heavier wooden one, in her hand. She grasped it, moved her hand, and she ended up hitting herself on the forehead with it. All morning I have had anxieties that I've damaged her brain, as she was crying after it. There's no mark or lump. Reassure me that I am being silly, please!