Answer:
Step-by-step explanation:
The internal clock system in a newly born baby is not synchronized with the 24 hour clock system of the real world and thus most of the newly born babies hardly sleep more than 4 hour at a time. The Circadian rhythms of a fetus is synchronized with the mother's heart rate and breathing when he/she is in womb. After birth a child has to develop its own circadian rhythms when exposed to sunlight and night frequently but this process takes time.