Most babies can now track a moving object with their eyes for longer than a couple of seconds. Try passing a colourful rattle in front of your baby's face. You may be rewarded with coos and gurgles of pleasure. Her head is steadier now, too, and she may even be able to lift it up when lying flat on her stomach on the floor or a changing mat. Short periods of time on the floor will help her strengthen her neck muscle but stay close by, she can easily get tired.