Final answer:
Toilet training for bowel movements in children typically starts when children are around 1 year old and have the ability to control their bowel movements.
Step-by-step explanation:
Toilet training for bowel movements in children typically starts when children are around 1 year old. By this age, children have developed the ability to control their bowel movements. They may show signs of readiness, such as being able to communicate their needs, imitating others using the toilet, or having regular bowel movements. While the exact age and readiness may vary for each child, the majority of children are toilet trained by age 4.