Model prediksi berat lahir bayi berdasarkan pertambahan berat badan ibu selama hamil dan faktor lain di Puskesmas Wonosari II Kabupaten Klaten tahun 2010?2011 = Infant birth weight prediction models based on maternal weight gain during pregnancy and others factors in Puskesmas Wonosari II of Klaten in year 2010-2011