Typically, how many hours of sleep does a 3-month-old child need?

At this age, your baby will need about 15 to 16 hours of sleep through the night and day time. this is including the day time naps as well as proper sleep time at night. here's a very interesting article you could read, that shows you how to time baby's feed and sleep time http://www.babysleepsite.com/schedules/3-month-old-baby-sleep-and-feeding-schedule/