At 9 months of age, about 90% of infants take 2 naps /day and 5% take 3 naps /day and 5% take 1 nap/day.

The average total duration of naps is 3 hours but the range is 1-5.5 hours. 93% of infants nap between 2-4 hours.

Nap duration is largely under genetic control: some infants will usually take long or very long naps and others will usually take brief or very brief naps. Adjust the bedtime to keep your baby's sleep tank full between 4-5 pm. Don't compare babies.

Marc

Weissbluth Method Infant Nap App.