Experts say that hiccups in a person begin to appear in the womb (at the 9th week of pregnancy). Thus, hiccups are one of the earliest types of physiological activity that remain after birth.
According to experts, the fetus in the mother‘s womb hears the sounds of the external environment. At 5-6 weeks of development, the brain is formed in the fetus, and at 8-10 weeks, auditory analyzers appear.