Month 4 Baby's stomach has gotten larger, and he doesn't have to eat as often. Like, mushy cereal or pured baby food. And, he can reach out, and rap his fingers around an object. Now, something that will greatly amuse your child, is playing with his hands and feet. This can occupy them for quite awhile.
Baby can now understand basic sounds.
Color preferences change also at this point in time. Your baby will now prefer black and white over colors. Month 5 Physical developments are coming fast. He is now able to feed himself. Baby, can now repeat her favorite vocalization.