It takes time for newborn’s sleep to settle into a regular rhythm.  They actually do sleep a lot, in fact newborns sleep an average of 16 to 18 hours a day, but unfortunately, not always on your schedule.
 
Babies usually start sleeping through the night sometime between 6 weeks and 6 months of age. You can help your baby reach that milestone sooner rather than later by establishing healthy sleeping habits from the start.

Even the “best sleepers” run into sleeping problems. Anything from an ear infection to a bad dream can wake your baby. 

Amazing Baby Sleep Secrets - The best-selling book that puts infants and toddlers to sleep like magic.