The authors analysed 2,575 case histories of children hospitalised in 1981-1985 at pediatric department of regional hospital in Trzcianka (Piła region) taking to account: age, sex, permanent residence, duration of stay at a hospital, disease causing hospitalisation. Within the period studied both decrease of number of neonates (1-6 months old) and young children of (1-3 years old) admitted to the hospital and a tendency toward shortening time of hospitalisation were found. Among causes of hospitalisation the first were respiratory tract infections (88.3% of all admissions in 1981 but 69.8% in 1985), and acute diarrheas (22.1% of all admissions in 1981, 17.1% in 1985).