Infants and toddlers do not have communicative abilities in speech enough to express their feelings and
demands. Therefore, parents who do not have many experiences in raising children may feel a
psychological anxiety when they see and hear their babies crying. Both parts, parents having difficulties in
perceiving special features of infants’ cries, and infants not knowing how to control themselves and
continuously crying, make the situation worse and urge parents to do anything to soothe their children.
Cries of infants are the way of expressing their feelings or communicating with people around them. In
other words, physical as well as psychological conditions of infants can be understood through analyzing
their cries. This paper chose a special sound, the sound produced when adults in-take/eat udon, which
became very popular among parents watching YouTube where crying babies stopped as they heard the
sound. The paper analyzes its acoustic characteristics and further discusses its psycho-acoustic properties by
comparing the sound to the sounds of patting pregnant woman’s tummy and rubbing clothes around
pregnant woman’s tummy. Both sounds are considered the best in soothing infants. The sound of babies’
cries and the sound of in-taking udon are analyzed with respect to frequency, amplitude, and shapes of
wave-forms as well as duration. The periodic interval in both sounds is similar in between 0.5 to 1 sec.
The spectrogram also show broad frequency bandwidth just like white nose. In conclusion, two sounds are
similar to each other with 90% similarity. We also examined the success rate of playing the sound of
in-taking udon to crying babies as uploaded in YouTube, and we earned 90% of success rate in soothing
crying infants. 9 out of 100 children stopped their crying as soon as they heard the sound in question.