Sealing a stone birdbath

[PracticalTacticalBrilliance]

Can anyone help with this at all? We have a beautiful birdbath (stone I think) which has cracked. We've not had it for long so the company are sending out a replacement bowl, but I wondered if it would be possible to seal the new one so it doesn't crack in the future.

I've had a browse online and found lots of things saying it needs to be a non-toxic sealant so it doesn't harm the birds, but they're mainly US sites so I can't find what they're reccomending in the UK.
It'd be great to know if anyone else has done this with success. Thanks for any info!

If your confident enough food grade resin would be pretty good

You need to find out what the birdbath is made of and whether or not it is frost-resistant. Once you know that, you can decide whether it needs sealing or not.

Any idea why the first one cracked?

is it stone, or is it cast concrete/stone effect? You need to know what it is made of, and if it is frost proof.

Thanks for the replies!
It's this one www.gardensite.co.uk/garden-ornaments/borderstone-lizard-bird-bath.htm which says it's cast stone apparently.
It doesn't say it's frost resistant anywhere. I'm not sure why it cracked- it's just hairline but the water can drip through.