When to Move Your Child from an Infant Car Seat

August 29, 2025

Safety comes first for every family with young children. Selecting a suitable car seat is one of the first significant steps when you welcome a new baby. Many parents begin with an infant car seat, which supports newborns and smaller infants well. The right seat gives protection from the start.

There are many models available at any baby car seat online store. With so many choices, it can seem tricky to pick what works best. The main goal is to find a seat that fits your child and meets approved safety guidelines. Growth patterns vary for every child. Eventually, your baby will need more space and a different seat for proper support. Making the switch at the right time matters for both comfort and safety. This guide outlines how and when to move from an infant seat to a convertible car seat.

Why Start with an Infant Car Seat?

Infant car seats are made to fit small babies securely. The harness is firm and holds your baby in place. Many infant seats are lightweight and easy to carry between your car, home, and pram. They are designed for the first stage of life, keeping travel simple for new parents. For most families, this is the first car seat they will use.

How Long Can a Child Use an Infant Car Seat?

Every seat has a set of limits. The height and weight limits are in the product manual or on a label attached to the seat. These numbers are there to help you make safe choices. It is important to use the seat only while your child fits these guidelines. Following the instructions for your specific seat keeps your baby well protected on every trip.

Four Key Signs to Change Your Child’s Seat

Watch for these four clear signs. If you notice one of them, it’s time to look at a new seat.

1. The Weight Limit Has Been Reached

Every car seat has a maximum weight, usually between 13 kg and 16 kg. When your child weighs more than the limit set by the seat maker, the seat may not offer enough safety. It means it is time to move to a convertible car seat, even if your baby still seems content in the infant seat.

2. The Height Limit Has Been Met

Most children get taller before reaching their car seat's maximum weight limit. The typical height limit is between 70 cm and 83 cm. It’s advisable to refer to your seat’s manual or label for the check limit. If your child is taller than the limit, change to a bigger seat for safety.

3. Headroom Is Less Than One Inch

There must be at least 2.5 cm (one inch) between the top of your child’s head and the top edge of the seat. This gap gives added protection in sudden stops or an accident. When the space above your child’s head drops below one inch, the seat no longer meets safety needs.

4. The Seat Becomes Hard to Carry

As babies get heavier, the infant seat gets harder to lift. If you find it awkward or difficult to carry the seat with your child inside, you can switch to a convertible seat. The above arrangement makes daily routines easier for parents and supports your child’s changing needs.

Next Steps: Choosing a Convertible Car Seat

A convertible car seat is designed to serve children from babyhood to toddler years and beyond. Start with the seat rear-facing, as this is the safest option for young children. The same seat can later be used facing forward when your child grows. Follow the manufacturer’s instructions for weight and height when adjusting the seat.

Fit the new seat tightly in your car. Ensure the harness is flat and fits closely to your child’s body. When you tested it at the base, the seat should not exceed two centimetres. If you need advice, a certified car seat technician or a local Plunket office can help.

Using the Infant Seat a Bit Longer

Continue using the infant seat while your child meets the weight, height, and headroom limits. Some parents leave the seat fixed in the car and lift their child out, which can be easier as babies get heavier. Always check the limits and move to the next seat when the time comes.

Important Reminders

Keep your child rear-facing for as long as they fit the seat.
Do not use any car seat that has been in a crash.
Please ensure you carefully follow the seat manufacturer's instructions each time.
Ensure harness straps are smooth, flat, and snug on every trip.
Choose a seat approved for use in New Zealand.

Final Thoughts

Changing car seats is a crucial part of your child’s journey. By paying attention to these simple signs and rules, you can feel confident about keeping your child secure. See the handbook for your seat or consult a certified car seat specialist with queries. Keeping your child safe is always worth your time and care.