The Sims 3 store has a set of them called Wild Wears and I'm sure lots of fansites have toddler clothes.
If you meant how to get the toddler to change their clothes - they can plan outfits at dressers like older sims and their parents can change outfits for them.
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If you meant how to get the toddler to change their clothes - they can plan outfits at dressers like older sims and their parents can change outfits for them.