A baby who is ready to be fed is likely to begin crying quietly and slowly. The cry will build in volume, becoming loud and rhythmic. Each individual wail is likely to be short and low-pitched. The cry of hunger is a cue to feed your baby, unless you have fed your baby recently and are certain that your baby does not need more to eat. A baby who is in pain is likely to begin crying suddenly. The cry may be high-pitched and harsh. Each cry will be loud, brief, and piercing. This cry is designed to communicate urgency! If you hear the pain cry, respond immediately. Look for opened diaper pins or snagged fingers. If you see nothing, try soothing the baby. The pain may have passed, and the baby may need comforting.  If your baby has an arched back and hard stomach, the pain cry may be due to gas. Soothe your baby, and hold her upright when nursing to limit stomach gas.  If your baby's eye is red, swollen, or tearing, call your doctor. She may have a scratch or something in her eye such as an eyelash, which can cause pain. In the case of prolonged pain crying, the baby may be sick or injured. Call a doctor if your baby cries more when being held or rocked, especially if you detect a fever. If your baby under three months old has a fever (100.4 °F or 38 °C) call your doctor right away, even if she is not fussy. Fussy crying is mild and may start and stop, or go up and down in volume. Fussy crying may increase in volume if you ignore it, so don't hesitate to soothe your baby when he fusses. Fussy crying can communicate discomfort, or it may just mean your baby wants to be held. Babies often fuss at the same time every day, usually late in the afternoon or early in the evening.  Babies cry fussily when they want to be held. Newborns may often fuss to be held, as they are used to confined spaces.  Check the diaper of a fussing baby. Fussy crying can indicate a wet or soiled diaper. Check the temperature. Your baby might fuss because he is too hot or too cold. The fussy cry can mean frustration. A baby may fuss when...

TL;DR in Vietnamese:
Hiểu tiếng khóc "khi đói". Hiểu tiếng khóc "khi bị đau". Hiểu tiếng khóc mè nheo.