Babies develop at varying rates. Babies who acquire skills earlier than normal are not necessarily smarter, nor do they have a wider range of skills later in life.
Your child's development will meet normal expectation as long he or she acquires basic skills within the usual age range for that skill. If you think your baby is not acquiring skills at the appropriate rate, you should discuss this with her doctor or nurse practitioner.
Between two weeks and two months, infants should be able to...
respond to sound
vary their cry depending on whether they are hungry or uncomfortable
focus on objects 12 to 24 inches away
enjoy looking at and fixate on human faces
lift their heads off the bed when lying on their stomach