Week 2: Birth Averages

motor development is ____. what does this mean?

sequential (epigenisis), meaning they are based on whats done before and change as the baby does

4 directional concepts of development

cephalic to caudal, proximal to distal, mass to specific, gross to fine

caphalic to caudal

infant develops from the top down (head control before trunk control, UE control before LE control)

proximal to distal

from midline, controls midline of neck then trunk, then shoulders and pelvis, THEN hands/feet/legs

mass to specific

acquires simple movements and then progresses toward complex movements (learns to move whole body then with dissociate one limb or body part)

gross to fine

larger mm movement and progresses to small manual skills (grasp before finger movement)

delivery preterm

before 27 weeks

average birth weights

6-9 lbs (avg 7)

small for gestational age (SGA) birth weight

less than 10th percentile for average gestational age

low birth weight

less than 5lbs

high birth weight

more than 8lbs 13oz

normal length

19 3/4 inch

weight loss/gain after birth

babies will loose up to 10% of body weight in first few days, back to birth weight by 2 weeks

weight gain if formula fed

doubled by 3-4 months

weight gain if breastfed

doubled by 4-6 months

birth weight and length at 1 year

3x birth weight, 50% birth length