1 Infant crying translator can help novice parents to understand why babies cry. 2. This app can identify four physiological requirements of infants including hungry, sleepy, pain, and wet diapers. 3. The recognition accuracy is up to 92%, 85.4%, 83.8%, and 77% for infants born within 2 weeks, 1 month, 2 months, and 4 months, respectively. After several amendments, this app can apply to different week-old baby.4. This app is suitable for infants from different nationalities, races, and gender.5. This app provides error correction mechanism, it can automatic learning as the baby grows.6. The identification result is only for reference, if the baby is still crying, medical treatment is necessary.