To put infant nighttime awakenings in perspective, an increase in nighttime awakenings during the second six months is most common. 23-33 percent of one and two year-olds are still waking during the night to an extent that it troubles the parents.
Much more likely causes of regular, repeated nighttime awakenings are: colic, nighttime feedings, excessive feedings before bedtime, food allergies (e.g. cow's milk), environmental disturbances. Everyone, including infants, wakes many times during the night, but we usually go back to sleep without fully becoming awake. If this child awakes several times during the night and can self-calm herself back to sleep, I would not be concerned at all. Parents often attribute wakenings, especially those accompanied by whimpers or crying as proof the child is not sleeping well; this is not the case. If you wish to read much more about this subject and how to help your child get to sleep at any age or stage, I suggest you read Dr. Richard Ferber's "How to Help Your Child Sleep Through the Night". Good luck and pleasant dreams.