This is common in Asia, but I am not sure if it is in Western country.
That is some parents in Asia don't want to put diapers on their toddlers. Instead, they often find a suitable time to take their toddlers to the bathroom & sing or say "/ʃ/" sound to help them to pee or poo.
In the dictionary,
[intransitive, transitive] to make musical sounds with your voice in the form of a song or tune She usually sings in the shower. I just can't sing in tune! He was dancing around and singing at the top of his voice(= very loudly). sing to somebody He was singing softly to the baby. sing something to somebody Will you sing a song to us? We all sang ‘Happy Birthday’ to her. sing somebody something Will you sing us a song? sing something Now I'd like to sing a song by the Beatles. sing somebody to sleep She sang the baby to sleep (= sang until the baby went to sleep).
In the dictionary, people say "sing somebody to sleep", but sometimes we don't sing them to pee / poo, we may say "/ʃ/" sound as a good way to help them to pee / poo
Do we say "to sing the toddler to pee / poo" or do we have similar common terms in English?