... more sophisticated communication between parents and their babies would permit potty training to start and be completed much earlier.
Western babies are potty trained later these days and need diapers until an average of three years of age. But even infants can be potty trained. A study by researchers at Sahlgrenska Academy, University of Gothenburg, Sweden, followed 47 infants and their mothers in Vietnam -- where potty training starts at birth and the need for diapers is usually eliminated by nine months of age.
... the baby's ability to control its bladder improves efficiency and reduces the risk of urinary tract infection, researchers say.
The technique is based on learning to be sensitive to when the baby needs to urinate.
"The woman then makes a special whistling sound to remind her baby," Anna-Lena Hellström says. "The whistling method starts at birth and serves as an increasingly powerful means of communication as time goes on."
According to the study, women notice signs of progress by time their babies are three months old. Most babies can use the potty on their own by nine months of age if they are reminded, and they can generally take care of all their toileting needs by the age of two.
"Our studies also found that Vietnamese babies empty their bladders more effectively," Professor Hellström says. "Thus, the evidence is that potty training in itself and not age is the factor that causes bladder control to develop." [emphasis mine]