# Day 87: Thirteen weeks

> The 4-month checkup is the next fixed point: what it covers, the second round of shots under the AAP schedule, the screen about you, and a gentle early look at the 4-month list.

- Series: Your third month, day by day (https://chorevia.com/learn/third-month), day 87 of 120, week 12
- Canonical URL: https://chorevia.com/learn/third-month/day-87
- Last reviewed: 2026-10-21
- Publisher: Chorevia (https://chorevia.com)
- Cite as: Chorevia. "Day 87: Thirteen weeks." Last reviewed October 21, 2026. https://chorevia.com/learn/third-month/day-87

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.

One checkup behind you, one ahead. Thirteen weeks is a good day to know what the next one is for.

## Heart

At the 4-month well visit, expect measurements, an exam, and questions about sleep, feeding, and safety. Under the AAP schedule, babies may get second doses of rotavirus, DTaP, Hib, pneumococcal, and polio vaccines. Your pediatrician will ask how you're feeling, and if you're breastfeeding, may talk about the AAP's advice on an iron supplement until iron-rich solid foods start at about 6 months ([AAP](https://www.healthychildren.org/English/ages-stages/Your-Childs-Checkups/Pages/Your-Checkup-Checklist-4-Months-Old.aspx)). The AAP's 2026 schedule differs from CDC's ([AAP](https://www.healthychildren.org/English/news/Pages/AAPs-recommended-childhood-and-adolescent-immunization-schedule-for-2026.aspx)), so ask which one your pediatrician follows.

## Head

The visit will also ask about milestones, so it helps to know how the list works. CDC's 4-month checklist lists skills at least 75% of babies show by that age, so it describes the months ahead, not what your baby must do today ([Zubler et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35132439/)). By 4 months, most babies hold their head steady, hold a toy put in their hand, swing an arm at toys, push up on forearms, coo, turn toward your voice, and chuckle ([CDC](https://www.cdc.gov/act-early/milestones/4-months.html)). A missed one at the visit is a reason to check in, not to wait and see ([Zubler et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35132439/)).

## Body

Two things to carry in. Your pediatrician should ask how you're doing at the 1-, 2-, 4-, and 6-month visits ([Earls et al., 2019](https://pubmed.ncbi.nlm.nih.gov/30559120/)); plan to answer honestly. And bring up a head that always tilts one way, or a flat spot; early treatment of a tight neck usually works and can prevent lasting unevenness ([AAP](https://www.healthychildren.org/English/health-issues/conditions/Cleft-Craniofacial/Pages/Head-Tilt.aspx)).

## Try today

### A milestone look, month three

- **Time:** 10 minutes, spread across the day, when your baby is alert
- **From the guide:** [What's developing](https://chorevia.com/learn/2-months#whats-developing)

1. During a cuddle, hold your baby upright and notice whether their head stays steady ([CDC](https://www.cdc.gov/act-early/milestones/4-months.html)).
2. On the floor, tummy-down with you right there, watch whether they push up onto elbows or forearms ([CDC](https://www.cdc.gov/act-early/milestones/4-months.html)).
3. Put a rattle in their hand and hold a toy within reach: do they hold it, swing an arm at it, bring hands to mouth ([CDC](https://www.cdc.gov/act-early/milestones/4-months.html))?
4. Talk, then go quiet: do they coo, make sounds back, turn toward your voice, chuckle at a silly face ([CDC](https://www.cdc.gov/act-early/milestones/4-months.html))?
5. Write down what you saw, what you didn't, and what you're unsure about, for the visit.

**Make it work:** This is the 4-month list looked at early; nothing on it is due today ([Zubler et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35132439/)). If your baby was born early, use corrected age ([AAP](https://www.healthychildren.org/English/ages-stages/baby/preemie/Pages/Corrected-Age-For-Preemies.aspx)).

## Watch for

- **Normal:** a list with gaps; it's written for 4 months, not 13 weeks ([Zubler et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35132439/)). **Tell your pediatrician now** if your baby doesn't smile at you or look at your face, doesn't react to loud sounds, or can't hold their head up on their tummy ([CDC](https://www.cdc.gov/act-early/milestones/2-months.html)).
- **Normal:** eyes that mostly hold steady now; occasional wandering or crossing should be going away by 2 to 3 months ([AAP](https://www.healthychildren.org/English/ages-stages/baby/Pages/Babys-Vision-Development.aspx)). **Bring it up** if your baby's eyes still often cross or wander after 3 months ([AAP](https://www.healthychildren.org/English/ages-stages/baby/Pages/Babys-Vision-Development.aspx)).
- **Normal:** newborn reflexes fading: rooting around 4 months, the palm grasp at 5 to 6 ([AAP](https://www.healthychildren.org/English/ages-stages/baby/Pages/newborn-reflexes.aspx)). **Tell your pediatrician** if a reflex seems different on one side ([AAP](https://www.healthychildren.org/English/ages-stages/baby/Pages/newborn-reflexes.aspx)).
- **Normal:** wondering whether something is off and not being sure. **Don't wait:** ask about developmental screening, or call your state's early intervention program for a free evaluation; you don't need a referral or a diagnosis to call ([CDC](https://www.cdc.gov/act-early/families/concerned.html)).

## For you

The question list, two about you. Start the page for the 4-month visit now, with your own two questions at the top so they don't get squeezed out. The pediatrician will ask how you're feeling ([AAP](https://www.healthychildren.org/English/ages-stages/Your-Childs-Checkups/Pages/Your-Checkup-Checklist-4-Months-Old.aspx)); your questions make the answer longer than "fine." Try "I'm still not sleeping when the baby sleeps. Is that normal?" or "Who do I call about this if it gets worse?"

Then the baby's: feeding, sleep, head shape, anything from today's look, and which vaccine schedule they follow.

If you're the partner: question three is yours. Write it down tonight.

## Sources

- American Academy of Pediatrics. "Checkup Checklist: 4 Months Old." HealthyChildren.org, 2023. https://www.healthychildren.org/English/ages-stages/Your-Childs-Checkups/Pages/Your-Checkup-Checklist-4-Months-Old.aspx
- American Academy of Pediatrics. "AAP Releases Recommended Childhood and Adolescent Immunization Schedule for 2026." HealthyChildren.org, 2026. https://www.healthychildren.org/English/news/Pages/AAPs-recommended-childhood-and-adolescent-immunization-schedule-for-2026.aspx
- Zubler JM, Wiggins LD, Macias MM, et al. "Evidence-Informed Milestones for Developmental Surveillance Tools." Pediatrics, 2022. https://pubmed.ncbi.nlm.nih.gov/35132439/
- Centers for Disease Control and Prevention. "Milestones by 4 Months." Learn the Signs. Act Early., 2026. https://www.cdc.gov/act-early/milestones/4-months.html
- Earls MF, Yogman MW, Mattson G, Rafferty J; AAP Committee on Psychosocial Aspects of Child and Family Health. "Incorporating Recognition and Management of Perinatal Depression Into Pediatric Practice." Pediatrics, 2019. https://pubmed.ncbi.nlm.nih.gov/30559120/
- American Academy of Pediatrics. "Head Tilt (Torticollis)." HealthyChildren.org, 2020. https://www.healthychildren.org/English/health-issues/conditions/Cleft-Craniofacial/Pages/Head-Tilt.aspx
- American Academy of Pediatrics. "Corrected Age For Preemies." HealthyChildren.org, 2026. https://www.healthychildren.org/English/ages-stages/baby/preemie/Pages/Corrected-Age-For-Preemies.aspx
- Centers for Disease Control and Prevention. "Milestones by 2 Months." Learn the Signs. Act Early., 2026. https://www.cdc.gov/act-early/milestones/2-months.html
- American Academy of Pediatrics. "Infant Vision Development: What Can Babies See?" HealthyChildren.org, 2024. https://www.healthychildren.org/English/ages-stages/baby/Pages/Babys-Vision-Development.aspx
- American Academy of Pediatrics. "Newborn Reflexes." HealthyChildren.org, 2022. https://www.healthychildren.org/English/ages-stages/baby/Pages/newborn-reflexes.aspx
- Centers for Disease Control and Prevention. "Concerned About Your Child's Development?" 2026. https://www.cdc.gov/act-early/families/concerned.html