Developmental Milestones 6 Months

8/4/2019 Developmental Milestones 6 Months

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DevelopmentalMilestones

( 6 12 ) monthsGross Motor Development includes

controlling the head, sitting, crawling, maybe evenstarting to walk, supported walking, ...


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6-Month-OldsDevelopment

Progressionof:

Rolling

Sitting


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Rolling Progression

Two rolling progression:

(i) Non-segmental Rolling(ii) Segmental Rolling


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Non-segmental Rolling

Also called as Log Rolling

Child performs this from birth to6 months

Child able to roll from supine toside-lying.

This movt is based on neckrighting reaction.


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Segmental Rolling

Develops at approximately 6months of age.

Body-righting reactionacting on the bodyis a

predominantfactor in movt at 6 months

Movt is not as one unit,Rather it is of differentsegment: trunk, shoulder

girdle, pelvic girdle, U.E, L.E

Requires rotation within bodyaxis, the vertebral column.Referred as intra-axialrotation


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Rolling Prone to Supine

Before infant rollsvolitionally, rolling fromprone to supine, and supineto prone often occurs

accidentally.

Child lifts buttocks higherfrom the surface, pushesinto supporting surface withfoot, child accidentally roll

prone to supine


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Other types of rolling:

(a)Rolling from prone to supine- Leading with U.E

- Leading with L.E

(b)Rolling from supine to prone- Leading with U.E

- Leading with L.E


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Segmental rolling from prone to supine,leading with upper extremity


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Segmental rolling supine to prone, rolling leading withupper extremity


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Sitting Progression1. Propped Sitting

Child sits w/o external support, i.e:- either being held or- sitting with a backrest

Child attempts to prop with U.E- weight shifted forward- hands full contact with floor surface

Major weight bearing role- hands and buttocks create a tripod base- gives a larger and more stable BOS thansitting w/o propped propping support ofhis U.E

Child fixes progravity, strongly contractinghip flexors to increase the stability. Progravity stabilizing motor behaviours isreferred to fixing into gravity rather thanfixing against gravity.


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2. Early Independent Sitting

Able to sit alone

Arms used for balance

Able to manipulate object with one hand

while the other holds it

Sitting and manipulating at once may still

be a challenge


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3. Ring Sitting

Ring sitting = position of L.E Trunk extension becomes stronger,child eventually rely less on U.Esupport and wide base, until handsis lifted from surface

Child erect sitting, pelvisperpendicular to surface, utilizing trunkextension to maintain upright(antigravity) . To further secure trunk extension orstability w/o propping, child holds U.E in

high guard position. Usage of rhomboid muscles. L.E Ring sitting provides wide BOS Child can only remain stable w/o fall


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4. Half Ring Sitting

As child experience increasingstability in independent sitting, childbegins to move L.E out of ringposition into:

(i) Half-Ring Sitting(ii) Long Sitting

Ability to have one L.E in front,neutral hip rotation and a (slight)extended knee

Other side of hip flexed, externallyrotated with knee flexed


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5. (Simple) Long Sitting

Both leg extended (slight) More commonly seen Neutral hip rotation & slight

extended knee

BOS narrowed mediolaterally(compare to ring sitting) Allows lateral weight shift easily


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6. Mature Long Sitting

Both legs extended High guard position Child is more stable when

this sitting is achieved

BOS narrowed mediolaterally Allows lateral weight shift easily

* The wider the BOS, the difficult it isto shift weight. Therefore, child wouldmove beyond ring sitting with

narrower BOS in order to movearound (weight shifting).

Developmental Milestones 6 Months

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