Child Development
Separation Anxiety in Babies: When It Starts and How to Actually Handle It
Jeehoo Jeon·12 min read
Jeehoo Jeon
Jeehoo is a maternal health researcher and content writer at Onzenna. She approaches every topic the same way: dig into the evidence, cut through the noise, and tell you what actually matters. Her writing is calm, informed, and built for the mom who wants the real answer — not an opinion dressed up as a fact.
86 articles
Baby Names
Biblical Baby Names: Timeless Names with Deep Meaning for Your Child
Biblical baby names have held strong for centuries—not because of religious trends, but because they
Jeehoo Jeon·12 min read
Baby Names
Unique Baby Boy Names for 2026: Uncommon and Strong Options That Stand Out
More parents are moving away from top-10 names toward unique baby boy names that reflect individuali
Jeehoo Jeon·13 min read
Health Guides
Baby Fever: When to Worry and When It’s Normal
A baby fever isn’t always cause for alarm — but knowing which temperatures and symptoms demand immed
Jeehoo Jeon·13 min read
Health Guides
Signs of Colic in Babies: What to Know and How to Get Through It
Colic follows a specific pattern—the Rule of Threes—that separates it from normal newborn fussiness.
Jeehoo Jeon·13 min read
Trying to Conceive
Signs of Ovulation: What Your Body Is Telling You During Your Fertile Window
Signs of ovulation include changes in cervical mucus, basal body temperature shifts, and physical se
Jeehoo Jeon·14 min read
Trying to Conceive
How to Track Ovulation: 5 Methods Explained (So You Actually Know When You’re Fertile)
How to track ovulation involves reading five basic signals your body sends during your cycle. Master
Jeehoo Jeon·14 min read
Child Development
Toddler Speech Delay: Signs to Watch and What Actually Helps
Toddler speech delay means language is developing more slowly than expected, but the range of normal
Jeehoo Jeon·16 min read
Sleep Guides
The 4-Month Leap: What Your Baby Is Learning (and Why Sleep Goes Sideways)
The 4-month leap is a fundamental rewiring of your baby’s brain where object permanence, cause-and-e
Jeehoo Jeon·11 min read
Child Development
When Do Babies Start Talking? Speech Milestones From Birth to 3 Years
Babies communicate from day one—but not with words. Learn when babies start talking, what babbling m
Jeehoo Jeon·14 min read
Child Development
Baby Milestones by Month: Your Complete 0-12 Month Guide
A milestone is a skill that typically emerges within a predictable age range — but that range often
Jeehoo Jeon·14 min read
Baby Safety
Baby Choking vs. Gagging: Why the Difference Matters (and How to Respond)
Gagging and choking look scary, but they’re two completely different things — and knowing the differ
Jeehoo Jeon·14 min read
Health Guides
When to Take Your Infant to the ER for Fever: A Parent’s Real-Talk Guide
When to take your infant to the ER for fever depends on age more than temperature. Infants under 3 m
Jeehoo Jeon·14 min read
Sleep Guides
One Month Old Sleep Schedule: What’s Normal and How to Build a Routine That Works
A one month old sleep schedule isn’t a schedule yet — it’s 14–17 hours broken into short, unpredicta
Jeehoo Jeon·15 min read
Health Guides
Antifungal Cream for Yeast Diaper Rash: How to Spot It, Treat It, and Actually Make It Go Away
Yeast diaper rash looks distinctly different from regular diaper rash and requires antifungal cream
Jeehoo Jeon·15 min read
Health Guides
Signs an Infant Has an Ear Infection: What Parents Need to Know
Infants can’t tell you their ear hurts, so parents must read behavior carefully. Learn the most reli
Jeehoo Jeon·14 min read
Health Guides
Infant Teething Rash: How to Spot It and Soothe Your Baby’s Sore Skin
Infant teething rash appears when excess saliva from teething breaks down the skin barrier on your b
Jeehoo Jeon·15 min read
Health Guides
Cradle Cap on Ears: Why It Spreads There and What Actually Works
Cradle cap on ears isn’t spreading from the scalp—it’s appearing independently because ears create t
Jeehoo Jeon·14 min read
Health Guides
Infant Rash on Chest: A Parent’s Visual Guide to What’s Normal (and What’s Not)
Most infant rash on chest cases are a normal part of newborn skin development, not a parenting failu
Jeehoo Jeon·15 min read
Health Guides
Tiny Bumps on Newborn Skin: Baby Acne, Milia, and What’s Actually Normal
Tiny bumps on newborn skin are usually caused by maternal hormones and normal skin colonization, not
Jeehoo Jeon·15 min read
Sleep Guides
Sleep Training Methods: A Parent’s Guide to Every Approach (And What Actually Works)
Sleep training is the process of helping your baby learn to fall asleep independently, and the right
Jeehoo Jeon·16 min read
Health Guides
Teething Fever: Is It Real? What Parents Actually Need to Know
Teething does not cause a true fever, according to the American Academy of Pediatrics. Any temperatu
Jeehoo Jeon·13 min read
Health Guides
Infant CPR: A Step-by-Step Guide Every Parent Should Know
Infant CPR is not just a scaled-down version of adult CPR — the anatomy is different and the techniq
Jeehoo Jeon·14 min read
Health Guides
SIDS Prevention: What the Evidence Actually Says (and What You Can Actually Control)
SIDS prevention starts with understanding which evidence-backed practices actually reduce risk — and
Jeehoo Jeon·14 min read