First Minister Carwyn Jones has led Welsh messages of congratulations to the Duke and Duchess of Cambridge.
"Many congratulations to the Duke and Duchess of Cambridge on their wonderful news" he tweeted.
The Leader of the Welsh Conservatives in the Assembly, Andrew RT Davies, also tweeted a message of support, describing the news as "the perfect end to a Jubilee year.
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Campaigners are calling on the Welsh Government to launch a public information campaign.