# Day 179: What six months changed

> The 6-month list as a look back, not a test: what most babies do around now, what you did every day to get here, and the photo and letter for the box.

- Series: Your sixth month, day by day (https://chorevia.com/learn/sixth-month), day 179 of 365, six months
- Canonical URL: https://chorevia.com/learn/sixth-month/day-179
- Last reviewed: 2026-10-21
- Publisher: Chorevia (https://chorevia.com)
- Cite as: Chorevia. "Day 179: What six months changed." Last reviewed October 21, 2026. https://chorevia.com/learn/sixth-month/day-179

This guide is general education that summarizes published research and guidance from groups like the American Academy of Pediatrics, the CDC, and the WHO. It isn’t medical advice, and every child develops on their own timeline. Your pediatrician knows your child; if something feels wrong, call them. In an emergency, call 911.

Six months tomorrow. Today is a look back, the 6-month list held loosely, and a photo in the spot where you took the first one.

## Heart

By 6 months, most babies know familiar people, like to look at themselves in a mirror, and laugh; take turns making sounds, blow raspberries, and squeal; put things in their mouth, reach for a toy they want, and close their lips to say they don't want more; roll from tummy to back, push up on straight arms, and lean on their hands to sit ([CDC](https://www.cdc.gov/act-early/milestones/6-months.html)). Read it as "most babies, around now," not as a score. The CDC lists are built so that at least 75% of babies show each skill by that age, which means a missed one is a reason to check in and a hit is just a Tuesday ([Zubler et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35132439/)). If your baby was born early, count from the corrected age until age 2 ([AAP](https://www.healthychildren.org/English/ages-stages/baby/preemie/Pages/Corrected-Age-For-Preemies.aspx)).

## Head

What you did. Every reply that came right after a babble made the next babble more speech-like ([Goldstein et al., 2003](https://pubmed.ncbi.nlm.nih.gov/12808137/)). Every tummy-time minute on the floor went into rolling: a review of 16 studies linked tummy time to better gross motor development ([Hewitt et al., 2020](https://pubmed.ncbi.nlm.nih.gov/32371428/)). Every board book was shared reading, which the AAP recommends from birth ([Klass et al., 2024](https://pubmed.ncbi.nlm.nih.gov/39342414/)). None of it looked like teaching. It was a conversation, a floor, and a book, 180 times.

## Body

The range is still wide, and tomorrow's list doesn't close it. Many babies roll both ways by about 7 months and stay upright in a sit by 6 to 8 ([AAP](https://www.healthychildren.org/English/ages-stages/baby/Pages/Movement-4-to-7-Months.aspx)); in a WHO study of 816 children, almost all healthy babies first sat alone somewhere between 3.8 and 9.2 months ([WHO Multicentre Growth Reference Study Group, 2006](https://pubmed.ncbi.nlm.nih.gov/16817682/)). First teeth usually come between 6 and 10 months, and some babies have none at a year ([AAP](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/Babys-First-Tooth-Facts-Parents-Should-Know.aspx)). Whatever your baby does today is a point in that range, not a verdict on it. What comes next, from first bites to sitting alone, is the [6-month guide](https://chorevia.com/learn/6-months).

## Try today

### Six-month photo and letter

- **Time:** 15 minutes
- **From the guide:** [What's developing](https://chorevia.com/learn/5-months#whats-developing)

1. Put your baby in the spot where you took the day-one photo, propped sitting or on their tummy, with your hands close.
2. Take the picture, then one of the two of you, then one of your baby's hands around their own foot.
3. Write a short letter: what they do now that they couldn't do then, one thing that was hard this month, and one that made you laugh.
4. Date the envelope and keep it with the day-one letter.

**Make it work:** Don't stage a milestone. If they roll off the mark or cry, that's the photo, and the truest one you'll own.

## Watch for

- **Normal:** a baby who does most of the list and skips a line. **Call your pediatrician** if your baby doesn't laugh or seem to know familiar people, or has lost skills they once had ([CDC](https://www.cdc.gov/act-early/milestones/6-months.html)).
- **Normal:** no teeth yet, or one bottom tooth just breaking through. **Call your pediatrician right away** if your baby has a fever higher than 104°F (40°C), or looks or acts very sick ([AAP](https://www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Fever)).
- **Normal:** a topple at the end of a sit, caught by your hand. **Call your pediatrician now** for any head injury in a baby under 1, even if they seem fine ([AAP](https://www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Head+Injury)).

## For you

The photo of you, again. Not the one with the baby; you, in the chair, on day 179, however you look. Someday your child will want to see who was there, and the album will be empty of you unless someone takes this one.

Six months is when you drop off most people's radar as "just had a baby." Don't drop off your own. Tell any provider you see in the next six months that you were pregnant within the last year ([CDC](https://www.cdc.gov/hearher/maternal-warning-signs/index.html)). That list still counts at six months: a headache that won't go away, chest pain or a fast-beating heart, trouble breathing, heavy bleeding, thoughts of harming yourself or your baby ([CDC](https://www.cdc.gov/hearher/maternal-warning-signs/index.html)).

If you're the partner: you take the photo of her. Then write one line in the letter yourself.

## Sources

- Centers for Disease Control and Prevention. "Milestones by 6 Months." Learn the Signs. Act Early., 2026. https://www.cdc.gov/act-early/milestones/6-months.html
- Zubler JM, Wiggins LD, Macias MM, et al. "Evidence-Informed Milestones for Developmental Surveillance Tools." Pediatrics, 2022. https://pubmed.ncbi.nlm.nih.gov/35132439/
- American Academy of Pediatrics. "Corrected Age For Preemies." HealthyChildren.org, 2018. https://www.healthychildren.org/English/ages-stages/baby/preemie/Pages/Corrected-Age-For-Preemies.aspx
- Goldstein MH, King AP, West MJ. "Social interaction shapes babbling: testing parallels between birdsong and speech." Proceedings of the National Academy of Sciences, 2003. https://pubmed.ncbi.nlm.nih.gov/12808137/
- Hewitt L, Kerr E, Stanley RM, Okely AD. "Tummy Time and Infant Health Outcomes: A Systematic Review." Pediatrics, 2020. https://pubmed.ncbi.nlm.nih.gov/32371428/
- Klass P, Miller-Fitzwater A, High PC; AAP Council on Early Childhood. "Literacy Promotion: An Essential Component of Primary Care Pediatric Practice: Policy Statement." Pediatrics, 2024. https://pubmed.ncbi.nlm.nih.gov/39342414/
- American Academy of Pediatrics. "Movement Milestones: Babies 4 to 7 Months." HealthyChildren.org, 2021. https://www.healthychildren.org/English/ages-stages/baby/Pages/Movement-4-to-7-Months.aspx
- WHO Multicentre Growth Reference Study Group. "WHO Motor Development Study: windows of achievement for six gross motor development milestones." Acta Paediatrica Supplement, 2006. https://pubmed.ncbi.nlm.nih.gov/16817682/
- DiMaggio D, Cernigliaro J. "Baby's First Tooth: 7 Facts Parents Should Know." HealthyChildren.org, 2022. https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/Babys-First-Tooth-Facts-Parents-Should-Know.aspx
- American Academy of Pediatrics. "Fever" (symptom checker). HealthyChildren.org, 2026. https://www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Fever
- American Academy of Pediatrics. "Head Injury" (symptom checker). HealthyChildren.org, 2026. https://www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Head+Injury
- Centers for Disease Control and Prevention. "Urgent Maternal Warning Signs and Symptoms." HEAR HER, 2024. https://www.cdc.gov/hearher/maternal-warning-signs/index.html