Infant Car Seat vs. Convertible: Chicco KeyFit 35 or Graco Extend2Fit?

No, and this is the most important thing to understand before you spend. Both must pass the same federal crash standard, FMVSS 213, to be sold in the United States. Price differences buy easier installation, longer fit ranges, nicer fabrics and lighter carriers: not a higher safety ceiling. Easier installation does translate into real-world safety, because misuse rates are high and a correctly fitted budget seat protects better than a misused expensive one. But no seat on sale is ‘unsafe’.

Yes, and plenty of families do. A convertible that fits from four pounds is approved for a newborn, and it saves you a purchase. What you lose is the carrier. Every trip means unbuckling the baby, and every arrival home means waking them. Whether that matters depends on your life: if you drive rarely and mostly to places you stay a while, skip the infant seat. If you do short errands with a sleeping baby, the infant seat earns its money in the first six months alone.

As long as the seat’s limits allow. A rear-facing seat spreads crash forces across the whole back and supports the head and neck, which matters enormously while a child’s neck is still developing. Bent legs are not a reason to turn a child around, children sit cross-legged happily, and leg injuries in rear-facing crashes are very rare. Seats with high rear-facing weight limits exist precisely so this is easy to do.

Yes. The date is stamped into the plastic shell or on a label, typically six to ten years from manufacture. The reasons are real: plastics become brittle through years of temperature cycling in a car, harness webbing degrades, and labels become unreadable. Never use a seat past its expiry date, and never use one that has been in a moderate or severe crash even if it looks undamaged, manufacturers publish their own crash-replacement guidance.

Only if you know its complete history, which in practice means from someone you trust. You need to know it has never been in a crash, has no unapplied recalls, is within its expiry date, has all original parts and labels, and has not been stored somewhere extreme. A stranger cannot credibly confirm any of that, so a marketplace or thrift-store seat is a genuine risk. This is one of the few pieces of baby gear where buying new is the clear recommendation.

Free inspection by a certified child passenger safety technician is widely available and badly underused. A large share of seats are installed with at least one error. Fire stations, hospitals, police departments and public-health agencies commonly host checking stations, and national databases list appointments by postcode. Book one before the birth if you can, and again when you switch to forward-facing. Twenty minutes, no cost, and it is the highest-value thing on this page.