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Is this normal for toddlers or is it a red flag? - toddler genitals photo

A mother of the year of 2.5. old man called me and told me that her son carries his penis in her toys. It's not going into details or anything, so I know what I said. I know that children at this age are aware of their genitals and are recognized when they are naked. This behavior is normal, or should do about his mother's worry? She believes that this is a "phase" can be.