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Pregnancy Guide/Second Trimester/Week 21

Week 21: Dad's Guide

Second Trimester • Baby is the size of a a 10" tablet

Week 21 of 4053% there

👶 Baby Update

Size: A 10" tablet

Baby's movements are getting stronger and more coordinated. Eyebrows and eyelids are fully formed. Baby is swallowing amniotic fluid, which helps develop the digestive system.

💕 What She's Going Through

Braxton Hicks contractions may start — irregular, painless tightening. Stretch marks might appear. Heartburn becoming more common. She may feel the baby respond to sounds.

💪 What You Should Do This Week

  • Start setting up the nursery — paint now while there's time and energy
  • Register for a car seat installation check (fire stations do free checks)
  • If she hasn't already, encourage her to sign up for a breastfeeding class

🚫 Don't Say This

Stretch marks? Already?

Stretch marks are genetic — no cream prevents them. They're tiger stripes, not flaws.

🧠 Dad Hack

Paint the nursery NOW. You need several weeks for fumes to dissipate. Use low-VOC or zero-VOC paint.

Ready to gear up?

Our interactive checklist tracks everything you need.

Baby Gear Checklist →