Why not buy some premium bonds for the baby?
You can spend as much or as little as you want, £5, £10, whatever.
I was bought some when I was a baby. You have them for ever and if your number comes up you can win thousands!
They write to you if you win or you can check the numbers online.
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Old aunts used to come up to me at weddings, poking me in the ribs, cackling and telling me
'You'll be next.' They stopped when I started doing the same to them at funerals.