What is your baby's schedule

Every day my baby does something else. Yesterday she took three naps and went to sleep at 8:00. Other days she takes one nap and goes to sleep at 6:00. If she sleeps 12 hrs at night she is less likely to take two naps but she can surprise me. Everyone says to not let them nap past 4:00 but than she goes to sleep too early and either wakes too early or only takes one nap and acts drowsy. I am finding that her second nap is often after 3:00 or 4:00. Are there really rules or are do all babies have different needs and body clocks.