I also think that if the grant is to be given then it should be given earlier on in pregnancy but not too early i.e not at confirmation of pregnancy stage. Not a nice thing to think about, I know, but many pregnancies do end in early miscarriage (before 12 weeks) so the grant would be given and then not be able to be used for the purpose which it was intended for. I know that miscarriage is always a possibility but after 12 weeks there is a significant drop in the likelihood of this and yet it's still early enough to make a difference through healthy eating so maybe they could give people the grant at around the 12 week mark.
Could they not also make them only redeemable against healthy food like fruit, veg, etc and prevent people from getting beer and fags with them?

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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.