Babies also have different sleep cycles than adults.
Early-infant sleep is quite different from the sleep of adults. Read and listen to the arguments for the selections, then tell us what we missed or got wrong. Journal of American Academy of Child Psychiatry 1974;13 344-356.
By having the infant cope with these short time intervals the infant eventually in matter of days develops his own methods of calming down and falling asleep. Environmental constraints on infant care practices. Allow time for naps each day as needed for the age of the baby. Harkness S, Super C, Keefer CH, van Tijen N, van der Vlugt E.