What age do kid become toddlers

I’ve been in many parenting classes and have read what to expect first year and the toddler years. After telling someone *politely* toddlers start at said age. She got rude and was like “as a mom I don’t know where you got that from but it’s this and that”. Well as a mom Susan I’m sorry you feel as though I was being rude and you had to he rude back. I was just informing you. Just curious as to what age you consider to be a toddler.

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