They found three factors significantly associated with later training. The first—and probably the one that explains variation over time—is later initiation of potty training. Children who start training later complete training later. The other two factors relate to poop. Children who were frequently constipated, or who showed resistance to pooping in the potty (formally “stool toileting refusal”—more on this to follow) tended to train later. The authors argued that these factors could also increase over time, although they largely put the blame for later training on the later initiation of the
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