Goggles for a toddler

Hi, just been out for a ride with my youngest in a wee ride seat. He's 20 months old so still pretty small. It was pretty wet and muddy in the woods and he got splashed in the face. This has got me a bit concerned and I'd like to get his some eye protection. Just wondering if anyone had any advice regarding goggles or glasses that will work ok with his helmet?
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Come in age 1-3 and only a fiver. Think I might get some myself!
Cheers
Strava