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No longer will OSAS vx OSNAS be allowed to be debated, argued, or discussed in theology forum. Too much time is required to monitor and rescources used to debate this subject which hasn't been definitively decided in 3,000 years.
"Toddler" is a word descriptive of how a very young child walks. Not quite as controlled as they will be by the time they are somewhere between three and four or thereabouts.
"Pre-school" just refers to old enough for some learning in school subject type environment but younger than kindergarten age, in general then maybe a two to four year old.
The term used in any instance is probably most context generated.
If you are simply describing a little youngster you may identify them as a toddler to evoke a picture of how they move about at that age.
If you are describing a youngster with emphasis on age with emphasis on intellectual development you more likely use "pre-school".
But the world wouldn't come to an end if either word is chosen.
Child's brain is still developing. At 2-3, they are learning about self, using words such as "I" and "me", where the mind weaves a story about self (ego). At 3-4 they are starting to learn how their self fits into the world they walk through (pre-school).