AbstrakBerat badan merupakan ukuran antropometri yang dipakai sebagai indikator yang terbaik untuk mengetahui keadaan gizi dan tumbuh kembang anak. Salah satu faktor yang paling mempengaruhi berat badan adalah pemberian Makanan Pendamping Air Susu Ibu (MP ASI). Data pemberian MP ASI pada anak usia 6-23 bulan di Puskesmas Cluwak Kabupaten Pati Jawa Tengah tahun 2015 masih sangat rendah yaitu sebesar 23,33%. Penelitian ini bertujuan untuk mengetahui hubungan faktor yang mempengaruhi pemberian Makanan Pendamping Air Susu Ibu (MP ASI) terhadap berat badan anak usia 6-24 bulan di Puskesmas Cluwak Kabupaten Pati Jawa Tengah. Penelitian ini menggunakan metode observasional analitik dengan pendekatan cross sectional. Metode sampling yang digunakan adalah purposive sampling, dengan jumlah sampel 91 anak. Analisis data penelitian menggunakan uji Chi-Square dan regresi logistik. Hasil penelitian menunjukkan bahwa terdapat hubungan antara faktor yang mempengaruhi pemberian Makanan Pendamping Air Susu Ibu (MP ASI) yaitu faktor usia pertama (p = 0,000), jenis (p = 0,000), frekuensi (p value= 0,000 dan jumlah (p = 0,002) pemberian MP ASI terhadap berat badan anak umur 6-24 bulan di Puskesmas Cluwak Kabupaten Pati Jawa Tengah. Hasil analisis regersi logistik menunjukkan bahwa faktor yang paling mempengaruhi berat badan anak umur 6-24 bulan adalah jenis dan usia pemberian MP ASI.Kata Kunci: berat badan anak, MP ASI FACTORS AFFECTING OF COMPLEMENTARY FEEDING PRACTICES ON 6-24 MONTHS CHILDREN'S WEIGHT IN CLUWAK COMMUNITY HEALTH CENTER IN PATI DISTRICT AbstractBody weight is anthro-pometric measure to determine the nutritional status and child development. One of the most affecting factor of body weight is complementary feeding practices. Data from Cluwak community health center about complementary feeding practices on 6-24 months children are still very low, amounting to 23.33%. The aim of this research was to know the correlation between factors affecting of complementary feeding practices on 6-24 months children's weight in Cluwak community health center, district of Pati in central java. This research was used survey analytic observational method with cross sectional approach. The sampling method used was purposive sampling, with a sample size was 91 respondents. Analysis of the research was using Chi-Square and logistic regression. The results showed that there was a significant correlation between factors affecting of complementary feeding practices consist of age of children (p value=0,000), variety (p value= 0,000), frequency (p value= 0,000) and quantity (p value= 0,002) on 6-24 months children's weight in Cluwak community health center, district of pati in central java. The logistic regression analysis showed the most significant factors affecting of complementary feeding practices on children's weight was a variety of complementary feeding and the first age of giving complementary food.