What to write
What to write in a new baby card for your sister
Your sister becoming a parent is a big one — warm, proud, and a little emotional is exactly right.
Quick answer
You're a mum — and I couldn't be prouder. Congratulations, sis. This little one is so lucky to have you.
New baby messages for your sister
Watching you become a mum has made me love you even more. Welcome to the world, little one.
Congratulations, sis. If you're half the mum you've been a sister, this baby has won the lottery.
A whole new person to love, and a whole new side of you to adore. So happy for you and your little family.
Officially the doting relative already. Congratulations, sis — I love them to bits.
So proud of you. Wishing you sleep, snuggles, and the softest start for your beautiful baby.
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Questions
What do you write in a new baby card for your sister?
Your sister becoming a parent is a big one — warm, proud, and a little emotional is exactly right. The strongest messages name one specific, true thing about them and say plainly how you feel — keep it short and it lands harder.
How long should a new baby message be?
One to three sentences is plenty. A short, specific line beats a long, generic paragraph — people remember the detail, not the word count.
New baby messages for someone else
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