How long does a baby sleep after birth? A) ranges from 30 minutes to about four hours
B) between 20-45 minutes only
C) between 3-4 hours only
D) ranges from 2-3 hours only

Your baby will be tired after the efforts of being born. But as well as adjusting to his new life outside your womb (uterus), he's on a tremendous growth spurt and will need plenty of sleep to fuel this. Your baby may sleep for up to 18 hours over the course of 24 hours.

answer; i believe that the correct answer is (b) is a factor associated with physical activity and heart disease;

the answer is anaerobic activities