Preferred by 800,000+ Families Worldwide
The Doctor-Recommended Solution For Tummy Troubles
We’re glad your doctor sent you!
First Day’s Pre+ Post+ Probiotic gummies balance the gut to help relieve upset tummies, bathroom accidents, weakened immunity, vomiting & diarrhea, constipation, and bad breath & oral health.*
Kids' Belly Biotic
A unique 3-in-1 pre, post, and probiotic.
The First Day Impact
Target Symptoms of An Unbalanced Gut With Just 2 Daily Gummies
Target Symptoms of An Unbalanced Gut With Just 2 Daily Gummies
Poor Oral Health
Poor gut flora can contribute to bad breath and cavities.*
Tummy Troubles
Bloating, gas, constipation, and other digestive issues can signal poor gut health.*
Constant Sugar Cravings
An imbalanced microbiome can sometimes drive kids to crave more sugar.*
Low Immunity
A struggling gut can weaken the body’s natural defenses, making it harder to fight off everyday bugs.*
Raising the Bar on Kids' Nutrition
Developed Alongside Harvard & Yale Scientists
Our product was crafted with input from leading scientists at Harvard and Yale, combining the latest research with high-quality ingredients to deliver a tribiotic parents can trust.
Backed By Modern Science
Our tribiotic isn’t just a blend of ingredients—it’s a formula built on cutting-edge science. From the latest studies to carefully measured doses, each gummy reflects the best of modern nutritional science.
Pediatrician-Approved
Recommended by pediatricians, our tribiotic is designed to meet the unique needs of growing children, ensuring they get the support they need from a trusted source.
Clean Label Project Certified
Our products have been independently tested by the Clean Label Project for harmful chemicals like heavy metals, pesticides, and plasticizers, and meets their standards for purity and exceeding typical industry practices.
Ingredients Sourcing and Dosage
We source each ingredient with care, choosing only the highest quality vitamins and minerals. Our dosage is tailored for kids, providing safe and effective support without risking overuse or unwanted additives.
45 Day Money-Back Guarantee¹
Over 800,000 Parents Are Helping Their Kids Reach Their Full Potential
We've Got the Whole Family Covered.
Kids, Teens, Moms and Dads!
Daily Multis
Made to fill everyday nutrient gaps with essentials that support focus, better sleep, fewer sugar cravings, and brain health.*
Gut Health
Formulated with prebiotics, probiotics, and postbiotics to support digestion, regularity, and a healthy gut-brain connection.*
Calming Magnesium
Formulated natural ingredients to support stress relief, muscle relaxation, mood balance, and better deeper sleep*
Starter Packs
The easiest way to get started—bundled options to support immunity, sleep, skin, and energy with options for the whole family.*
Experts Love Us!
Our scientific mentors are leading doctors, scientists, and most importantly parents. They help guide First Day's mission to build a better future for families everywhere.
Dr. Ed Giovannucci, MD, MPH, ScD
Harvard University
In 1984, Dr. Giovannucci graduated with his medical degree from the University of Pittsburgh. He then spent the next 8 years at Harvard, working for his Doctor of Science Degree. Since then, he has climbed to the top of his field.
Yale University
Dr. Chen is a renowned pediatrician who works at Yale University.
In 1997, he graduated with his Medical Degree from New York University. He spent his time at the Yale School of Medicine, as well as the Yale-New Haven Children's Hospital. He also graduated with a Masters of Health Science from the Yale School of Medicine in 2010.
"I truly believe in our mission of bringing better health to families."
"After learning about the massive amounts of sugar that were in typical kids multivitamins, I built a list of 198 Harvard and Yale nutritionists, pediatricians, and professors. From there, two of the top researchers at Harvard and Yale agreed to help!
I explained my story to them, how I wanted to help parents, and what I found about the vitamin industry. And they were a huge help in creating this breakthrough in kids nutrition.
That's why we’re so confident First Day will help you get the results you want. If within the first 45 days you find yourself not completely satisfied, we’ll give you your money back - no questions asked.**"
**We offer a 45-day satisfaction guarantee for returns. It covers 45 days starting from the day that you place an order and includes only the very first purchase of any product so that families can try our gummies - for any reason you aren't happy with your vitamins. Please note that we will refund up to $100 so that you can try up to 3 bottles of our gummies risk free. If you would like to order more than 3 bottles in your first order, we recommend that you ordering less so that your family can try them first. Thanks so much for your understanding!
1. Based on a survey of First Day customers
*These statements have not been evaluated by the Food and Drug Administration.
This product is not intended to diagnose, treat, cure or prevent any disease.
