Kristen reveals they had great success transitioning their eldest child, Lincoln, when she was still a toddler, so they never expected to face such a struggle the second time around.
"My oldest daughter at 21 months, we merely suggested that she use the toilet in the other room and (she) never wore another diaper beyond that," the "Frozen (2013)" star said on the latest episode of her "Momsplaining with Kristen Bell" digital series, on which she welcomed fellow actresses Maya Rudolph and Casey Wilson as guests.
"We were lying in bed giggling about this, my husband and I, like, 'Why does everyone make a big deal out of this potty training? It's so easy. Just tell the kid to use the toilet.'"
However, Kristen confesses things haven't been as simple with young Delta, and they still haven't been able to convince her to fully ditch the diapers.
"Currently, my youngest is five and a half, still in diapers," she shared.
"It's real relative, isn't it?" Maya, a mother-of-four, replied, as Kristen agreed, "Yes, because every kid is so different."