To that end, the Feels will come to those witnessing or living through a particularly moving moment when their heart is fullest and add additional emotion until the heart can no longer contain the pressure.
Most parents start the training when their children are between two years and three years old. But there's no official age, and you needn't potty train your toddler at all if you don't want to.
Children of either gender aren't usually ready to begin potty training earlier than approximately 18 months of age, and most children aren't physically or emotionally prepared to start until many months beyond that.