The authoresses are intending to show the actuation of the public health nurse in a Medical Assistance Center of the "Divisão de Saúde da Comunidade da Secretaria de Higiene e Saúde da Prefeitura do Município de São Paulo" near 76 children that presented as characteristics different degrees of underfeeding, less weight and prematureness, through a program of individual orientation, weekly or fortnightly, as de case