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"I wish I knew of a vastly superior option (ie, safer option) for buying kids or baby clothes."

Just buy the long underwear and "base layer" items from either REI or Patagonia.

Very versatile and utilitarian, last forever, and you can buy them directly from the source - either online or at an actual retail store.

We had patagonia base layer onesies and long underwear, etc., that were handed down across three children.