2 year old’s poop suddenly has a very strong chemical like odor

My 2 year old’s poop has had an extremely foul, almost chemical or mothball-like odor for the last few days. It’s noticeably different from his usual (normal toddler-gross) smell.

A few details:

Age: 27 months

Normal diet overall

Recently has been eating more high-fibre foods at daycare (lots of beans)

He’s been taking occasional Tylenol this week for a lingering cold

No other symptoms - acting normal, eating fine, normal energy

Stools look normal in color and texture, just the very strong chemical-like smell

No new medications, vitamins, or exposures I’m aware of.

I mentioned it to my partner who thinks I’m overthinking it, but the smell is genuinely different and intense.

Is this something that can just happen with diet / illness, or does a chemical/mothball odor point to anything concerning (malabsorption, infection, metabolic issue, etc.)? At what point should I get him checked out?

Thanks in advance!