Baby experiments by making new sounds. She recognizes parents and siblings. All babies have their own internal developmental timetable. If you have concerns about your baby's development, discuss them with her doctor. Once your baby has mastered this skill, she'll try the tricky stuff grabbing one hand with the other and then pulling them apart.
New skills call for new toys.
Give your baby toys with knobs, handles, and loops anything that provides an easy grip. Crib gyms and play gyms are great at this age. Your baby can lie under them and squeeze, bat away, or kick at the brightly colored objects that hang within her reach. Mirrors and bells are popular attractions on these gyms, too. Be sure to check the toy package label for information regarding age appropriateness.