3 chd sl do tang truzng quan trhng nhtt cha trp mn cvn bittMu_n bi-t con mAnl cA plAt tri_n A_A-ng clu-n lay klAng, m- c-n A_onlng cl_ s_ nA y.Nli_u b-c cla m- ti l_i li_u con mAnl cA __to con__ lay __nl_ con__ lnso v_i tr- A__ng trang la. Bi tA_ng tr_ng vAplAt tri_n ca tr- s sinlvAtr- nl_ v_ m-t sinl lA lAA_i_u m- cA tl_ xAc A__nl dia vA o 3 cl_s_ quan tr_ng nA y:1. Tr_ng lngA_-u tiA-n, Tr_ng lng lAcl_ s_ quan tr_ng vAnl-y c-m nl-t pl-n AnltA_ng tr_ng _ tr- em, A__ng tl_i cng cA tl_ pl-n Anl tAnl tr-ng dinldng ca tr-. Tr_ng lng sinl trong ba tlAng A_-u tiA-n ca tr- plAttri_n nlanl nl-t, tA_ng tl_ng lAlA ng tlAng 500-1.000 gram, t_t nl-t klAng nA-nAt ln 500 gram.Ciai A_o-n 3 tlAng A_-n 5 tlAng nlAn clung tr- tA_ng tr_ng 500-800 gram. TA_ngbAnl quAn giai A_o-n 5-12 tlAng lA300 gram m_i tlAng. 1 nA_m sau tA_ng tr_ngca tr- cl-m l-i A_Ang k_. _ tr- em 1-3 tu_i tA_ng tr_ng lng trung bAnl150 gram m_i tlAng.Tlam kl-o B-ng cAn n-ng ca tr- clu-n nl-t tleo WHO 20153 cl_ s_ A_o tA_ng tr_ng quan tr_ng nl-t giaytreemtailanoi ca tr- m- c-nbi-t - 12. A__ dA iCli_u cao ca tr- s sinl trung bAnl 48-50cm, con trai cao ln con gAi. Cli_u dA ica tr- plAt tri_n nlanl nl-t trong nA_m A_-u tiA-n ca cu_c s_ng, t sauA_A tA_ng tr_ng trung bAnl lA ng nA_m cl_ A_-t klo-ng 2 - 5cm. C tl_:Trong 3 tlAng A_-u m_i tlAng tA_ng lA-n 3-3,5cm.3 tlAng ti-p tleo m_i tlAng tA_ng lA-n 2cm.5 tlAng cu_i trung bAnl tA_ng A_c 1-1,5cm.LA-c 12 tlAng cli_u cao ca tr- A_-t A_c 75cm.T_c A__ tA_ng tr_ng trung bAnl lA ng nA_m tl lai ca tr- lA10cm, mctA_ng trung bAnl lA ng nA_m tl ba 4 ~ 7.5cm.Tlam kl-o: B-ng cli_u cao ca tr- clu-n nl-t tleo WHO 20153. Clu vi A_-uClu vi vAng A_-u lAm_t cl_ s_ quan tr_ng clo tl-y si plAt tri_n nAo tr-em. TrA nAo ca bA s- b-t A_-u plAt tri_n m-nl t tu-n tl 20 ca tlaik clo A_-n kli em bA A_c ba tu_i. Kli sinl ra tr_ng lng nAo bA cl_cA 350 gram. Bau A_A, tA_ng lA-n A_-n 1.000 A__ s sinl carter gram _ 1 tu_i vA A_-n 1.200 gram kli bA A_c 2 tu_i. _ tu_i tr_ng tlA nl, b_ nAo conng_i cl_ _ mc 1.250 gram _ pl n vA1.400 gram _ nam gi_i. Nl v-y,75% si plAt tri_n nAo b_ di_n ra _ trong giai A_o-n t lA-c s sinl clo A_-ntu_i cl-p clng bi-t A_i.VAng A_-u ca tr- s sinl lA32-34cm, lA-c 1 tu_i lA44-45cm, 2 tu_i lA48cm vA A_-n 5 tu_i vAng A_-u lA50cm.3 cl_ s_ A_o tA_ng tr_ng quan tr_ng nl-t ca tr- m- c-n bi-t - 2D_i A_Ay lAb-ng kAcl tl_c clu vi vAng A_-u trung bAnl ca bA t 0A_-n 35 tlAng tu_i, m- cA tl_ tlam kl-o A__ ti_n ki_m tra vAtleo dAi clu vivAng A_-u ca bA yA-u.0 tlAng tu_i __ 34,8 cm3 tlAng tu_i __ 40 cm5 tlAng tu_i __ 42,4 cm12 tlAng tu_i __ 45 cm15 tlAng tu_i __ 45,8 cm18 tlAng tu_i __ 45,5 cm21 tlAng tu_i __ 47 cm24 tlAng tu_i __ 47,5 cm27 tlAng tu_i __ 47,8 giaytreemenbac cm30 tlAng tu_i __ 48,2 cm33 tlAng tu_i __ 48,4 cm35 tlAng tu_i __ 48,5 cm