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Infant = niño Toddler = párvulo (or niño que comienza a andar / caminar)
Explanation: I believe that párvulo fits well into the context for toddler. The dictionary defines it as a small child.
Otherwise, niño que comienza a andar (a child that starts to walk) would be OK.
And for infant = niño. (child)
Robert INGLEDEW Argentina Local time: 02:52 Native speaker of: English, Spanish PRO pts in pair: 2664