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What the Data Says About Predicting Baby’s Biological Sex

Emily Oster, PhD on July 27, 2025

Sub title:
Despite what a recent paper says, it’s not a “weighted coin toss”

Seo title:
Why You Can’t Predict Your Baby’s Biological Sex

Meta Description:
Wondering what sex determines sex of baby? Emily Oster explains the science on ParentData and why predictions don’t work as many believe.

Emily Oster explains why you can’t reliably predict your baby’s biological sex—what the data say, where the “weighted coin toss” idea comes from, and why it’s misleading.

Which Pacifier or Bottle Nipple Is Best for My Baby?

Emily Oster, PhD on July 25, 2025

Sub title:
Q&A on preferences

Seo title:
Which Pacifier or Bottle Nipple Is Best for My Baby?

Meta Description:
Which Pacifier or Bottle Nipple Is Best for My Baby?

How Long Does It Take To Conceive?

Emily Oster, PhD on July 23, 2025

Sub title:
Q&A on conception timeline

Seo title:
How Long Does It Take to Conceive?

Meta Description:
How Long Does It Take to Conceive?

How to Treat Subclinical Hypothyroidism While Trying to Conceive

Gillian Goddard, MD on July 23, 2025

Sub title:
Q&A on Levothyroxine

Seo title:
How to Treat Subclinical Hypothyroidism While Trying to Conceive

Meta Description:
How to Treat Subclinical Hypothyroidism While Trying to Conceive

The Dos and Don’ts of Getting Pregnant

Emily Oster, PhD on July 23, 2025

Sub title:
What should you start doing, and a few things you should stop

Seo title:
The Dos and Don’ts of Getting Pregnant

Meta Description:
The Dos and Don’ts of Getting Pregnant

What Is the Data on Implanting Mosaic Embryos?

Kolbe Hancock, MD on July 22, 2025

Sub title:
Q&A on PGT-A test results

Seo title:
What Is the Data on Implanting Mosaic Embryos?

Meta Description:
What Is the Data on Implanting Mosaic Embryos?

What to Know About Infant Formula and the FDA Review

Emily Oster, PhD on July 21, 2025

Sub title:
Checking in on “Operation Stork Speed”

Seo title:
What to Know About Infant Formula and the FDA Review

Meta Description:
What to Know About Infant Formula and the FDA Review

Will Pregnancy Affect My Milk Supply?

Emily Oster, PhD on July 18, 2025

Sub title:
Q&A on nursing while pregnant

Seo title:
Will Pregnancy Affect My Milk Supply?

Meta Description:
Will Pregnancy Affect My Milk Supply?

Are American Kids Really Doing Much Worse?

Emily Oster, PhD on July 14, 2025

Sub title:
The data behind rising chronic disease and infant mortality rates

Seo title:
Are American Kids Really Doing Much Worse?

Meta Description:
Are American Kids Really Doing Much Worse?

How Many Words Should Kids Say? And When?

Emily Oster, PhD on July 11, 2025

Sub title:
Making sense of the CDC guidelines

Seo title:
ToddlerData: How Many Words Should Kids Say? And When?

Meta Description:
ToddlerData: How Many Words Should Kids Say? And When?

Wondering how many words a 14 month old should say? Emily Oster explains typical language milestones and offers tips to encourage your toddler’s speech growth.

Is NyQuil Safe While Breastfeeding?

Emily Oster, PhD on July 11, 2025

Sub title:
Q&A on cold medicine

Seo title:
Is NyQuil Safe While Breastfeeding?

Meta Description:
Is NyQuil Safe While Breastfeeding?

Should I Correct My Toddler’s Pronunciation?

Jennifer Shonkoff on July 10, 2025

Sub title:
Q&A on baby talk

Seo title:
Should I Correct My Toddler’s Pronunciation?

Meta Description:
Should I Correct My Toddler’s Pronunciation?

Preparing Your Child for a New Sibling

Emily Oster, PhD on July 10, 2025

Sub title:
What you can (and can’t) control

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Preparing Your Child for a New Sibling

Meta Description:
Preparing Your Child for a New Sibling

Is There a Link Between IVF Pregnancies and Autism?

Kolbe Hancock, MD on July 8, 2025

Sub title:
Q&A on birth outcomes

Seo title:
Is There a Link Between IVF Pregnancies and Autism?

Meta Description:
Is There a Link Between IVF Pregnancies and Autism?

Is It Normal to Have Varying IVF Cycles?

Breonna Slocum, MD on July 8, 2025

Sub title:
Q&A on differing outcomes

Seo title:
Is It Normal to Have Varying IVF Cycles?

Meta Description:
Is It Normal to Have Varying IVF Cycles?

What We Know (and Don’t) About the Microbiome

Emily Oster, PhD on July 7, 2025

Sub title:
Reviewing the possible claims about gut health

Seo title:
What We Know (and Don’t) About the Microbiome

Meta Description:
What We Know (and Don’t) About the Microbiome