Kho:ing 18 th:\ng
THO. Kt'
Khoang 1 2
thang
Khoang 1 8
thang
Khoang 36
thang
MVC T1£U
·
4
rang Clfa
a
ham tren Va ham dU'6'i mQC
tU>ng chil!c mot. Tre c6 the <:An thllc an
bang rang clia, c6 the dillu chinh IU'Q'ng
an vi dl,J nhU' chi can phan vU>a mieng.
. Rang ham van chU'a moc. LQ'i bi Sll'ng .
Tre ChU'a the can va nghien nat bang
rang ham.
·
Rang ham thll nhfit mQc
a
ham tren va
ham dU'&i, <:An kh&p v&i nhau. Nhll'ng vi
mc;it nhai van nho nen cho du c6 cim dlft
dll'Q'C nhll'ng chU'a nghien nat dll'Q'C.
·
Rang ham
&
hai ham tren va dU'6'i kh6'p
v6'i nhau bn dinh. C6 the nghien nat thllc
an, da CO the an dU'Q'C d6 an gan gibng
v6'i d6 an cua ngU'6'i 16'n .
Cach rang sfra
IDQC
/
6-8 thang (rang cua giua)
8- 1 2 thang (rang cua)
1 6-20 1h•ng 1''"9 n•nhl
(rang ham so 1 )
©
20-30 thang (rang ham so 2)
30 th:\ng
-
42 th:\ng
