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A freezer door shows bags and bottles of frozen breastmilk.

Updated on Oct. 21, 2025

2 minute read

Should I Throw Away Unused Thawed Breast Milk?

Emily Oster, PhD

A parent looks on as a pediatrician gives a smiling baby a vaccination.
In the news

Updated on Dec. 5, 2025

2 minute read

Should My Baby Get the Hepatitis B Vaccine?

Emily Oster, PhD

A group of babies listening to ParentData on headphones

Jul. 12, 2023

30 minute read

Random Acts of Data

Emily Oster, PhD

Personal view from a pregnant woman of her stomach from above. She is holding a stuffed rabbit and ultrasound.

Jul. 10, 2023

6 minute read

Three Big Changes in Pregnancy Data

Emily Oster, PhD

A close-up image of a gas stove against a yellow background.

Jul. 7, 2023

2 minute read

Is Benzene from My Gas Stove Poisoning My Family?

Emily Oster, PhD

A teddy bear peaks around navy blue blackout curtains.

Updated on Mar. 19, 2025

2 minute read

Should I Hang Blackout Curtains in My Baby's Room?

Emily Oster, PhD

A baby smiles and tilts head while being held.

Updated on Dec. 25, 2025

2 minute read

When Should I Stop Breastfeeding?

Emily Oster, PhD

A close up shot of a foot stepping onto an old-fashioned scale on a blue rug.

Jul. 3, 2023

7 minute read

Is There a Link Between BMI and Health?

Emily Oster, PhD

A felt illustration of a child in bed with a green monster under the bed.

Jun. 30, 2023

3 minute read

Why Is Bedtime Suddenly Impossible?

Emily Oster, PhD

A hand is seen lowering the blinds in front of a closed window on a hazy day.

Jun. 30, 2023

4 minute read

Will Wildfire Smoke Exposure Increase My Risk of Preterm Birth?

Christopher Worsham, MD

A children's slide and fort are seen, abandoned, on a smokey day.

Updated on Jan. 13, 2025

3 minute read

Can I Take My Kids Outside When There's Wildfire Smoke?

Christopher Worsham, MD

An array of used tissues and cold medicines on a yellow background.

Updated on Nov. 19, 2025

2 minute read

Why Aren't There Better Breastfeeding-Safe Medicines?

Emily Oster, PhD

A colorful wooden children's block puzzle is seen on a light blue background. The last piece is set outside the puzzle.

Jun. 29, 2023

7 minute read

What We Lose When We Find Parenthood

Denisse Myrick

Parent and two children stand on a dock over a pond on a muggy summer day while the parent fishes.

Jun. 26, 2023

3 minute read

Books, Podcasts, and Some Marriage-Saving Travel Advice

Emily Oster, PhD

Assorted vitamins and pills on an ultrasound and pink background.

Jun. 23, 2023

2 minute read

Can I Skip Prenatals?

Emily Oster, PhD

Brown eggs with smiley faces drawn on them in a white egg carton.

Updated on Apr. 18, 2025

3 minute read

Will Donating Eggs Come With Long-Term Risks?

Emily Oster, PhD