Expect your baby to become a social butterfly this month. At around six weeks, babies become more receptive to social interactions. Look for changes in your baby's expression when you change her diaper, feed her or pick her up. These are important social occasions in the life of an infant.

You may also notice signs that your baby has begun to anticipate certain activities, learning when one event routinely follows another. Here's something for you to anticipate. Your baby will probably flash her first "social smile" between two and four months, signaling a wonderful new stage in your relationship.