Buying an Infant-Only Car Seat for Your Newborn

Dad carefully buckles and checks the straps on his newborn daughter's carseat.
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Many parents assume that the only car seat option for newborns is the infant-only car seat carrier (the kind that snaps in and out of a base installed in your car). However, that's not true in most cases. There may be other car seat options for your newborn, such as a convertible car seat.

Infant-only car seats only face the rear of the vehicle. Some infant car seats have a weight limit of 22 lbs, but most new models available today have a weight limit of 30 lbs or more. Most infant-only car seats feature a stay-in-car base that makes it easy to carry a baby around in the car seat while outside the vehicle. Often, infant-only car seats are sold as part of a ​travel system with a stroller. Some very small newborns may need the lower starting weight provided by an infant seat.

Using a Convertible Car Seat for a Newborn

Some convertible car seats can accommodate a baby from 5 lbs to 40 lbs or more rear-facing, and then can be turned to use forward-facing for children 40 lbs or more. Each car seat's weight limits are posted on the car seat side labels and in the instruction manual, so you can easily find out whether a convertible car seat would be suitable for your baby.

Convertible car seats are larger, so it may be difficult to find a good fit if your baby is on the small side. However, many average to larger newborns can fit in a convertible car seat and be perfectly safe. And some convertible seats come with inserts to use when your baby is small. If your baby fits a larger car seat, it is perfectly OK to use a convertible car seat from the beginning instead of buying an infant-only car seat for the infant stage.

Convertible Seat Inserts and Padding

If the convertible car seat has newborn padding, be sure to check the instructions to find out when and how it should be used. While the padding pieces can be very helpful for creating a nice fit for a newborn, and may actually be required for the smallest end of the weight range for the car seat, there are usually weight limits for those pieces. You'll need to take them out of the car seat at some point as your baby grows.

One potential problem with a convertible car seat is that a newborn baby's shoulders may be below the lowest set of harness slots. It's important for baby's shoulders to be at least even with those harness slots, or above them, when rear-facing. If you go for a convertible car seat, look for one that includes infant padding to help a small baby fit the large car seat, and one with a fairly low set of harness slots for rear-facing.

Unfortunately, you won't be able to know ahead of baby's arrival whether or not your little one will fit a convertible car seat. Infant car seats are usually sized appropriately for newborns, so you're less likely to encounter this problem with an infant car seat unless your baby is very tiny.

All-in-One Seats

All-in-one car seats, or 3-in-1 car seats, are also an appropriate choice as long as one of the modes is rear-facing. Your newborn should also fit into the height and weight range for rear-facing to ride safely in these car seats. Again, the height and weight ranges can be found in the car seat instructions.

What Car Seat Should You Buy?

If your car seat budget allows the purchase of two car seats within a year or so, an infant-only car seat is likely to provide a better fit for newborns, and these car seats do offer a measure of convenience that some parents find invaluable. Some infant car seats provide additional side-impact protection and anti-rebound features, as well as a deeper shell to nestle baby inside the car seat, so infant-only car seats are not without their advantages.

Regardless of whether you start with an infant-only car seat or a convertible car seat, the most important thing is to choose a car seat that fits your baby and your vehicle.

Check the car seat labels to be sure your baby fits within the weight guidelines for that seat. Learn to install the car seat tightly and properly, using the manufacturer's instructions and your vehicle owners manual. Finally, keep your infant in a rear-facing car seat, whether that is an infant-only car seat or a rear-facing convertible car seat until your baby at least two years old. Rear-facing means your baby is five times safer in a crash, so finding a car seat that rear-faces to 30 or more pounds is a wise investment.

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  1. AAP. AAP updates recommendations on car seats for children. Updated August 30, 2018.