Human Growth and Development

Question 1

Preterm is defined as?

Answer 1

Preterm is a newborn with gestational age estimated as less than 37 weeks
*Late preterm is a newborn at 34 weeks to 36 weeks

Question 2

What are the weights for the following?
Low Birth Weight (LBW)
Very Low Birth Weight (VLBW)
Extremely Low Birth Weight (ELBW)

Answer 2

LBW: < or equal to 2500g
VLBW: < or equal to 1500g
ELBW: < or equal to 1000g

Question 3

What classifies as a large for gestational age (LGA) baby?

Answer 3

LGA: weight is above the 90th percentile; often associated with diabetic pregnancies

Question 4

Small for gestational age (SGA) can be classified into what two categories?

Answer 4

SGA can be classified as either symmetric intrauterine growth retardation (IUGR) or asymmetric intrauterine growth retardation

Question 5

What is the difference between symmetric and asymmetric IUGR?

Answer 5

With symmetric IUGR weight, length, and head circumference are SGA. This reflects a long-standing compromise and/or factors that are intrinsic to the infant such as a syndrome complex.

Asymmetric IUGR includes underweight for length and HC. It reflects an acute compromise extrinsic to fetus such as placental insufficiency

Question 6

Average US newborn length, weight and head circumference?

Answer 6

Length: 20.16 in (51.2 cm)
Weight: 7.63 lbs (3468 g)
HC: 14.2 in (35 cm)

Question 7

How much weight does an average newborn lose in the first 3 to 4 days of life?

Answer 7

An average newborn will lose 8-10% of their birth weight in the first 3-4 days of life but will regain it by 7 days (if formula fed), 14 days (if breastfed)

Question 8

Weight pattern for:
6 months
1 year
2 year

Answer 8

doubles by 6 months
triples by 1 year
quadruples by 2 years

Question 9

Length pattern for:
1 year
4 years
13 years

Answer 9

increases by 50% by 1 year
doubles by 4 years
triples by 13 years
* Increases by 1 inch per month during 1st 6 months and then 0.5 inch (1.3 cm) per month through first year

Question 10

What is the average weight gain per week during the first 6 months?

Answer 10

The average weight gain during the first 6 months is 5-7 oz (150-210 g)

Question 11

What is the average weight gain during months 6 to 12?

Answer 11

The average weight gain during months 6 to 12 is 12-20 oz.

Question 12

What is the average weight gain per month in the second year of life?

Answer 12

Average weight gain in second year is 8 to 9 oz per month (240 to 270 g)

Question 13

What is the pattern of growth for HC in newborns?

Answer 13

HC increases by 0.5 inches (1.3 cm) per month during the first 6 months
0.3 inches (0.65 cm) per month through the first year

Question 14

When do cranial sutures close?

Answer 14

Cranial sutures close during the first year of life.

Question 15

What are a newborns fontanel’s called and when do they close?

Answer 15

Posterior fontanel: closes by 6-8 weeks of age

Anterior fontanel: closes by 12-18 months of age

Question 16

When does teeth formation begin?

Answer 16

Formation of teeth begins during the third fetal month and continues through adolescence

Question 17

What are your first set of teeth called?

Answer 17

Your first set of teeth are called primary or deciduous teeth and are later replaced by permanent teeth.

Question 18

When do the following upper teeth erupt/shed:

1. Central Incisor
2. Lateral Incisor
3. Canine (cuspid)
4. First molar
5. Second molar

Answer 18

Erupt Shed

1. Central Incisor 8-12 mos 6-7 yrs
2. Lateral Incisor 9-13 mos 7-8 yrs
3. Canine (cuspid) 16-22 mos 10-12 yrs
4. First molar 13-19 mos 9-11 yrs
5. Second molar 25-33 mos 10-12 yrs

Question 19

When do the following lower teeth erupt/shed?

1. Second molar
2. First molar
3. Canine (cuspid)
4. Lateral incisor
5. Central incisor

Answer 19

Erupt Shed

1. Second molar 8-12 mos 6-7 yrs
2. First molar 9-13 mos 7-8 yrs
3. Canine (cuspid) 16-22 mos 10-12 yrs
4. Lateral incisor 13-19 mos 9-11 yrs
5. Central incisor 25-33 mos 10-12 yrs

Question 20

Survival reflexes are broken down into what three groups?

Answer 20

1. breathing, hiccups, sneezes, spitting up as infant tries to regulate breathing, sucking and swallowing
2. Temperature control reflexes: cry, shivering, tucking legs close to body
3. Feeding reflexes: sucking, rooting, crying and swallowing

Question 21

What are nonsurvival reflexes?

Answer 21

Babinski, stepping, swimming, grasping, moro or startle reflexes

Question 22

What is the palmer grasp?

Answer 22

It is the grasp reflex. Infant grips around an aboject that touches their palm. Strongest by 1-2 months and disappears by 3 months

Question 23

What is the plantar grasp?

Answer 23

The planter reflex will elicit a positive Babinski sign. Dorsiflexion of the big toe and fanning of the rest of toes ( positive Babinski sign). Disappears after 8 months

Question 24

What is the moro reflex?

Answer 24

The Moro reflex is an infantile reflex that occurs in response to a sudden loss of support. The response can be broken down into three parts:

1. spreading out of the arms (abduction)
2. unspreading the arms (adduction)
3. crying (usually)

It disappears by 6 months

Question 25

What is the stepping reflex?

Answer 25

Also known as dance/walking reflex. When a baby is held up right and their feet touches a flat surface, they lift one foot then the other.fe
Disappears before voluntary walking

Question 26

What is the fencing reflex?

Answer 26

Asymmetric tonic neck reflex. It’s when the face is turned to one side, the arm and leg on the side to which the face is turned extend and the arm and leg on the opposite side flex.
Diminished by 3-4 months, disappears by 6 months