Happy Envelope Club
Adjusting to a New Baby Sibling Letter
Adjusting to a New Baby Sibling Letter
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Becoming a big sibling is exciting - but it can also feel a little tricky! That’s where Ainsley the Amazing Big Sister Mermaid comes in.
This real letter, delivered by ‘snail mail’ straight to your child’s post box, helps them feel seen, supported, and celebrated as they adjust to life with a new baby. Written by an Early Childhood Educator in consultation with a psychologist, this enchanting, under-the-sea story validates your child’s emotions as Mermaid Ainsley shares her own journey of becoming a big sister. The letters supports your child’s working through any big feelings, and helps them embrace their new role with confidence.
What’s Inside the Envelope?
📜 A Letter from Ainsley the Amazing Big Sister Mermaid
Printed on luxe, thick paper and sealed with a custom, sparkly seashell wax seal, this enchanting letter weaves its reassuring message through a captivating undersea tale.
🌊 A Large Glittering "Best Big Sibling" Badge Sticker
This large, glittering badge of honour is perfect for your child to wear proudly when meeting the baby at the hospital or they can stick on their water bottle, backpack, or bedroom wall as a confidence-boosting reminder.
🎶 A Fun & Encouraging Poem
A playful rhyme that reinforces the message: love grows as families grow!
🖍️ Colouring-In Pages
Designed to keep little hands busy while helping them process their feelings through creativity.
Why Parents Love The Letter
✔️ Helps with a Smooth Transition – Less sibling jealousy, more confidence and connection.
✔️ Validates Big Feelings – Uses expert-backed techniques to make emotions feel normal and manageable.
✔️ Makes Parenting Easier – A ready-made, magical way to talk about family changes without stress.
✔️ Creates a Special Mailbox Moment – Because nothing beats the magic of receiving a real letter addressed just to them!
🎁 Perfect as a thoughtful gift or a keepsake for little ones stepping into their new sibling role.
She asked me to read it every night for a week straight. We stuck it on the fridge and she shows it to everyone. Thank you for helping us through a tricky time.
Perfectly timed, beautifully written, and it actually made my little girl feel special during a time when all the attention was on the baby. Highly recommend.
He'ss been struggling with the idea of not being the only child anymore, and this gave him something positive to connect with. Even his teacher noticed a change.
I teared up reading it before I even gave it to him. It was beautiful and so age-appropriate. He loved the illustrations too!
I wish I had known about this sooner. It'ss like a warm hug in the post. Total hit. Will be buying for all my friends having babies!