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Pokus trakcije
U pokusu posjedanja iz le\u0111nog polo\u017eaja, novoro\u0111en\u010detu zatiljak i glava zaostaju za ravninom le\u0111a tijekom cijelog postupka povla\u010denja. Na kraju pokusa, glava se mlohavo prevali prema naprijed. U dobi od tri mjeseca zatiljak \u0107e samo nakratko u po\u010detku pokusa pratiti razinu le\u0111a, a u \u0161estomjese\u010dnog dojen\u010deta sve do dosezanja sjede\u0107eg polo\u017eaja.