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.
Potty Training Around Age 4. Over the age of 4: If your child is over the age of 4 and fully potty trained by day, but having three to five wet incidents at night per week, talk to your pediatrician.