4 Month Old Baby Typical & Atypical Development Side by Side

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four-month-old typical atypical motor

development side-by-side in this video

you will see a typically developing baby

and an a typically developing baby in

eight different positions use this to

help recognize early motor delays please

remember to adjust for prematurity

position one supine head and body

position the typically-developing baby

on the left is able to hold his head in

mid line and has symmetry of the head

eyes arms and legs while the a

typically-developing baby on the right

has a symmetry of the head and

extremities his head is tilted and body

curved like the letter c presented a toy

when baby on the left has presented a

toy he shows visual engagement reaches

against gravity and explores toys with

both hands the a typically-developing

baby on the right is not visually

engaged he does not track the toy he

does move his arms but does not lift his

shoulders off the surface extremities

notice the typically-developing baby has

frequent anti-gravity movements and

extremity movement disassociated from a

stable trunk while baby on the right has

random movements and not much

anti-gravity movement positioned to

sideline head and trunk baby on the left

is able to lift his head and upper trunk

off the surface in preparation for

independent rolling baby on the right

cannot lift his head and upper trunk off

the support service posture notice

typically-developing baby on the left

can sustain this posture with a balance

of trunk flexor and extensor muscles

while baby on the right is unable to

sustain this posture because he lacks

balance of trunk flexors and extensors

extremities baby on the left is able to

use upper arms and disassociated lower

extremities to assist in facilitated

role baby on the right exhibits

sluggishness and his top arm during the

facilitated roll position three prone

head lifts

typically-developing baby moves his arms

forward to reach for an object and turns

his head freely a typically developing

baby uses only neck extension to turn

his head instead of forearm weight

bearing his head lifting is unsustained

elbows and shoulders baby on the Left

can bring his shoulders and upper arms

forward with elbows in front of the

shoulders baby on the right

keeps his hips flexed which shifts

weight forward keeping his elbows well

behind shoulders lower extremities baby

on the Left shows progression toward

lower extremity extension and adduction

baby on the right does not have the

capability to shift weight onto his

lower extremities position for pulled to

set head typically-developing baby

maintains his head in midline with no

head leg and good chin tuck a

typically-developing baby demonstrates

head leg throughout maneuver he cannot

sustain head lifting once upright

assisting in maneuver baby on the left

pulls forward with both arms and

abdominals to assist in the maneuver

baby on the right does not pull with his

arms or upper extremities position 5

sitting head baby on the left has good

head control and chin tuck with head in

the midline and he is able to turn his

head in all directions baby on the right

does not sustain head lifting in this

position and cannot turn his head or

look side to side with control vision

notice the typically-developing baby is

able to visually fixate on and begins to

track a toy the a typically-developing

baby is unable to use his vision in his

posture support typically-developing

baby's body needs support only at the

hips and pelvis

he has extension up to the mid thoracic

spine a typically-developing baby needs

support at his upper arms and shoulders

with maximum assistance to maintain this

position in sitting we see the

typically-developing baby moving

into anterior and posterior planes reach

for toys then returns to Syd the a

typically-developing baby uses extremity

posturing to compensate for decreased

proximal strength in sitting position

six horizontal suspension head the

typically developing baby is able to

keep neck and trunk extended with his

head upright 45 degrees and hold it

steady in the midline in this position

the a typically developing baby can only

hold his head up briefly and cannot

maintain extension or midline position

trunk in horizontal suspension the

typically developing baby has good trunk

extension with scapular adduction and is

able to freely move his arms and legs

the a typically developing baby is

unable to maintain trunk extension while

moving his arms and legs position seven

protective extension upper extremity

responds the typically developing baby

is using his arms to help sustain trunk

extension he cannot bring them forward

into a full protective response which

should be present by six months notice

the a typically developing baby uses

excessive asymmetry and keeps his arms

closer to his chest to sustain neck and

trunk extension extension the baby on

the Left has good extension through the

neck trunk and hips during forward

movement the a typically-developing baby

on the right is unable to sustain neck

trunk and hip extension during the

forward movement position eight standing

posture typically-developing baby can

maintain his head in midline and is able

to move freely he keeps his hips just

behind his shoulders and ankles in

plantar flexion notice the a typically

developing baby achieves head lifting

using neck extension his hips are well

behind his shoulders and he

intermittently flexes at the hips and

knees activity and lower extremity and

trunk the typically developing baby

demonstrates active extension into lower


and lumber spine and no full hip


while the a typically-developing baby

lacks adequate hip and trunk control for

sustained supported standing