Listen for the rhythm

The hungry cry is rhythmic. It rises and falls in a regular pattern, often described as a low, repetitive call: wah, wah, wah. It builds in volume over a few minutes if not addressed but rarely starts loud.

The pain cry is sudden and sharp. It starts at full volume, often after a moment of stillness, with a longer pause before the next wail. Researchers describe a pain cry as having a higher fundamental frequency and a more chaotic envelope than a hungry cry.

Look at the body

Hunger almost always pairs with rooting (mouth searching), hand-to-mouth motion, and a turning toward your chest. The body is otherwise relaxed.

Pain pairs with stiffness — clenched fists, arched back, legs that draw up sharply. A baby in pain often looks distressed in the face beyond just crying: a furrowed brow, tightly closed eyes, a downturned mouth.

Try this first

For a suspected hungry cry, offer a feed. Hunger should resolve within minutes once feeding begins. If the cry continues during the feed, hunger was probably not the cause.

For a suspected pain cry, check the easy causes first. A wrapped finger from a stray hair or thread, a diaper rash, a clothing tag, an ear that looks red. Check the temperature. If pain cries persist for more than thirty minutes despite these checks, call your paediatrician.

Trust your instinct

Parents are usually right about which cry is which, even when they doubt themselves. The cry analyzer in One Baby is a second opinion in the middle of a long night, not a replacement for the calm voice in your head. If something feels off, please call your paediatrician.