5 month still fits into a newborn/ 0-3 months?

I babysit a little boy he was 1 week early. He only wears a size one diaper and in a newborn size clothes still or 0-3 months. I'm pregnant and a first time mom, I'm not shaming his mom just curious if this is normal. I would ask her but I feel like she would think I'm being rude.

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