💚 Tetrasomy 18p Awareness

For Eli

A joyful little boy, a rare chromosomal condition, and the family walking this journey with him.

💚 Tetrasomy 18p World Day

Why 4/18?

📅 April 18

Tetrasomy 18p is named for its hallmark: four copies of the short (p) arm of chromosome 18. Four. Eighteen. 4/18. That's why every April 18th, families around the world wear green and share stories like Eli's — to make this rare condition visible to the people who've never heard of it.


Our Why

Meet Eli

Eli

Eli is a joyful, resilient little boy whose life reminds everyone around him what perseverance and love really look like.

Eli was born with Tetrasomy 18p, a rare chromosomal condition that affects only a small number of individuals worldwide. Like many children with this diagnosis, Eli faces unique challenges that impact his development and daily life. But what truly defines Eli isn't his diagnosis — it's his spirit.

Eli is full of personality. He brings laughter, curiosity, and determination into every room he enters. His journey has included therapies, doctor visits, and milestones that sometimes take extra time and hard work to reach. Yet Eli continues to show incredible strength and determination every step of the way.

Behind Eli is a family who loves him fiercely and advocates for him daily. Every achievement — big or small — is celebrated, because each one represents hard work, patience, and progress.

April 18th is Tetrasomy Awareness Day — the day families like ours wear green to stand with everyone living with Tetrasomy 18p. Awareness helps families get diagnosed sooner, connects them to other families walking the same road, and fuels the research that will one day improve care for every child with this condition.

Eli's story is one of courage, hope, and the power of community. By learning about him and sharing what you've learned, you're helping shine a light on a rare condition and the families who are walking this journey together.

Thank you for standing with Eli and the entire Chromosome 18 community.

What is Tetrasomy 18p?

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What it is

Tetrasomy 18p is a rare chromosomal disorder where an individual has four copies of the short arm (p) of chromosome 18, rather than the typical two.

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How rare?

Only a few hundred cases have been documented worldwide, making it one of the rarest chromosomal conditions. Each case is unique.

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Common challenges

Individuals may experience developmental delays, intellectual disabilities, speech differences, and various medical needs — but every child's experience differs.

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The need for research

Because Tetrasomy 18p is so rare, research funding is critical to improving diagnosis, care, and quality of life for affected individuals and families.

Donate to the Chromosome 18 Registry

The Chromosome 18 Registry & Research Society is the only nonprofit in the world exclusively focused on chromosome 18 conditions. Your donation funds research, family support, and advocacy for children like Eli.

⭐ Dedicate your donation in honor of Eli

When completing your donation, please add "In honor of Eli Berglund" in the dedication or tribute field.

Donate to Chromosome 18 Registry →

You'll be taken to a secure Give Lively page to complete your donation.

Our 2026 Awareness Campaign

In April 2026, friends, family, and strangers rallied around Eli and helped raise money and awareness for Tetrasomy 18p through our green shirt campaign. Every shirt worn, dollar donated, and story shared made a difference — and it means the world to our family. Thank you.

Green Tetrasomy 18p awareness shirt

The Awareness Shirt

Green is the awareness color for Tetrasomy 18p. Our shirt is still available on Bonfire for anyone who'd like one — wear it on April 18th or any day to help make this condition visible.

Get a shirt on Bonfire →