# Day 231: The car seat

> Thirty-three weeks. Your baby's first ride home needs a rear-facing car seat. Today you choose one approved for newborns and buy it new.

- Series: Your eighth month of pregnancy, day by day (https://chorevia.com/learn/pregnancy-month-8), day 231 of 280, 33 weeks
- Your baby this week: about the size of a pineapple; around 43.7 cm from head to heel
- Canonical URL: https://chorevia.com/learn/pregnancy-month-8/day-231
- Last reviewed: 2026-10-22
- Publisher: Chorevia (https://chorevia.com)
- Cite as: Chorevia. "Day 231: The car seat." Last reviewed October 22, 2026. https://chorevia.com/learn/pregnancy-month-8/day-231

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.

Thirty-three weeks. This week's notes are about one object: the car seat. Today you buy it, tomorrow you learn to fit it, and the day after you book someone to check it. Three short jobs, so the first ride home is the easy part.

## Your baby

Around now your baby is around 43.7cm long from head to heel, about the size of a pineapple ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)). Their brain and nervous system are now fully developed ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)). What's left is mostly growing and strengthening, and a body that, in a few weeks, needs carrying home safely.

## Your body

The NHS's job for this week is to plan how you'll bring your baby home: buy a new car seat, practise fitting it, and never carry your baby in your arms in the car ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)). The AAP adds the direction: "All infants should ride rear-facing, starting with their first ride home from the hospital" ([AAP](https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx)).

There are two kinds that work from day one. Rear-facing-only seats usually fit babies up to 22 to 35 pounds and 26 to 35 inches, depending on the model, before you move to a convertible seat; or you can start with a convertible seat installed rear-facing ([AAP](https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx)). Most convertible seats let children ride rear-facing for 2 years or more ([AAP](https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx)).

## Try today

### The car seat purchase

- **Time:** 30 minutes
- **From the guide:** [Car seat](https://chorevia.com/learn/newborn#car-seat)

1. Decide which kind: a rear-facing-only infant seat, or a convertible seat you'll install rear-facing ([AAP](https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx)).
2. Read the label: it should be approved for typical newborn weights. For twins, or if an early birth is likely, look for one approved for babies under 5 pounds ([AAP](https://www.healthychildren.org/English/ages-stages/prenatal/Pages/Last-Minute-Activities.aspx)).
3. Buy it new, as the NHS advises ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)), and keep the manual with it.
4. Check your car's manual for where a rear-facing seat goes: the back seat, ideally in the middle ([AAP](https://www.healthychildren.org/English/ages-stages/prenatal/Pages/Last-Minute-Activities.aspx)).

**Make it work:** A rear-facing-only seat is for travel, not for sleeping or feeding outside the car ([AAP](https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx)). If your baby falls asleep in it, the CPSC's advice is to move them to a crib, bassinet, play yard, or bedside sleeper ([CPSC](https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/cribs)).

## Watch for

- **Normal:** your bump tightening for 20 to 30 seconds, which shouldn't hurt. **Call your provider** or the hospital if the tightenings are painful or come regularly ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)).
- **Normal:** a heavy feeling low in your pelvis, which can mean your baby is head down ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)). **Call your provider** if your waters break, and tell them the time and the colour or smell of the fluid ([OWH](https://womenshealth.gov/pregnancy/childbirth-and-beyond/labor-and-birth)).
- **Normal:** feeling hot in a warm shop. **Call your provider** as soon as you can for fever or chills ([OWH](https://womenshealth.gov/pregnancy/youre-pregnant-now-what/pregnancy-complications)).

## For you

The car seat is often the first baby thing that makes it all feel real. If it sits in the hallway for a few days and makes you a bit teary each time you pass it, that's allowed.

If you're the partner: own the manual. Read the parts about newborns tonight, before tomorrow's practice fitting. The NHS says to practise fitting it ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/)), and practice goes faster when someone already knows where the belt goes.

## Sources

- NHS. "Week 33." Week-by-week guide to pregnancy, Best Start in Life. https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-33/
- American Academy of Pediatrics. "Car Seats: Information for Families." HealthyChildren.org, 2026. https://www.healthychildren.org/English/safety-prevention/on-the-go/Pages/Car-Safety-Seats-Information-for-Families.aspx
- American Academy of Pediatrics. "Last Minute Activities Before Delivery." HealthyChildren.org. https://www.healthychildren.org/English/ages-stages/prenatal/Pages/Last-Minute-Activities.aspx
- U.S. Consumer Product Safety Commission. "Safe Sleep – Cribs and Infant Products." CPSC. https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/cribs
- Office on Women's Health. "Labor and birth." U.S. Department of Health and Human Services. https://womenshealth.gov/pregnancy/childbirth-and-beyond/labor-and-birth
- Office on Women's Health. "Pregnancy complications." U.S. Department of Health and Human Services. https://womenshealth.gov/pregnancy/youre-pregnant-now-what/pregnancy-complications