Hi there and thank you for your question,
If the toddlers or young girls are in photos that could be considered to be explicit, or slightly of a sexual nature, then you are most CERTAINLY talking about illegal photos/images. If you think that somebody "might" become arroused or excited from seeing the pictures, WATCH OUT. Merely having downloaded the pictures would make you guilty of an offence.
If the toddlers or young girls are in photos that are more dress up, or "beauty pageant" type photos, then no, it's not illegal.
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Please note: This answer does not create an attorney-client relationship. Please consult a local attorney in person for legal advice. This information is being provided so you can better discuss legal matters with your attorney.