This is what Kathy Fray (author of "Oh Baby") says:
"However, the subject of parents directing infant sleep habits is a topic rife with controversy and oozing with “expert” opinions. But a good first place to start is to have a clearish understanding of how much sleep is “Normal” (bearing in mind that the only one thing we can truly name as “Normal” is a cycle on a Washing Machine).
Expect a Newborn to sleep about 16-20 hours in every 24 (of say 6-8 sleeps of 2-3 hours); with the evening sleep increasing by about a month old (to due date) of one 5-6 hour sleep at night (say 10pm-4am).
Expect a 2-3 month old to sleep about 15-18 hours in every 24, with about half of that at night (eg 7-8 hours overnight by 7-9 weeks of age, and say 9-11 hours overnight by 3-4 months), and the rest of Bub’s sleep as three day-sleeps of say 1½-3 hours each.
Expect a 4-6 month old to sleep about 15-17 hours in every 24, with about two-thirds of that at night (say 10-12 hours overnight by 16-24 weeks, eg 8pm-6am), and the rest as 2-3 day-sleeps of say 2-2½ hours each.
Expect a 6-8 month old to sleep about 15-16 hours in every 24, with about 10-12 hours of that overnight (say 8pm-6am), and the rest as a morning and afternoon day-sleep, each of say 1½-2½ hours each.
Expect a 9-12 month old to sleep about 14-15 hours in every 24, with about 11-12 hours of that overnight (say 7pm-6am), and the rest as two short day-sleeps (say 1½-2 hours), or one long day-sleep (say 3-4 hours).
Expect a 12-18 month old to sleep about 14-15 hours in every 24, including a 3-4 hour afternoon sleep, and say 10-12 hours overnight. (The day-sleep is usually finally dropped between the ages of 2-4 years.) "
Hope this helps.