Survival of the fittest  is a phrase that originated from an evolutionary theory as a way of describing the mechanism of natural selection. The biological concept of fitness is defined as reproductive success.
The normal respiratory rate is 30 to 60 breaths per minute from birth to one year, 24 to 50 breaths per minute from one to three years and 22 to 34 breaths from three to six years old. As the child moves into school-age, the normal respiratory rate slows. From age six to twelve, the normal rate is 18 to 30 breaths per minute, while 12 to 16 breaths is the normal rate from age 12 to 18.
Answer by Wendddy. Confidence votes 845. The normal pulse rate range for a 1 mo-12 mo old child is 120-160 beats per minute (avg 140). For 12 mo-2 years it is 80-140 bpm (avg 120). Keep in mind that our heart rates are slower during sleep and when it is cold.