Some toddlers do remember past lives.
Toddlers and children between the ages of 2 to 6 years old have had detailed memories of purported past lives, which is a phenomenon that is documented in thousands of cases.
The spontaneous and often verifiable memories of toddlers and young children of past lives, often feature descriptions of previous families, occupations and sometimes even traumatic lives which fade by age.
Memories of toddlers and children are most frequently from children between 2 years to 4 years of age, often when the toddler begins to talk.
Children might also claim that you're not my mommy or you're not my daddy, or talk about a former home or describe dying in a past life.
And some children even exhibit phobias that are also related to their reported past death or show knowledge and or skills that are not learned in their current life.
Even the University of Virginia School of Medicine has documented thousands of cases in which a child's statements ad matched the lives of people that are deceased.
Most of the time though these past lives being remembered and described by toddlers and young children are often dismissed as being imaginative play.
Or it could've been just a dream that the toddler or child has had and is then mentioning what they had seen in their dream.