Nuna's best-selling collection of infant car seats includes seven models: the Nuna PIPA, PIPA RX, PIPA Lite, PIPA Lite R, PIPA Lite LX , PIPA Lite RX and PIPA urbn.
Choosing a Nuna PIPA model involves choosing both a seat and a base.
Nuna offers two types of bases: the original PIPA base (as seen on the PIPA, PIPA Lite and PIPA Lite LX) and the newer RELX base (which comes with the PIPA RX, PIPA Lite R and PIPA Lite RX). The RELX base solves common installation problems while offering four recline positions to add comfort for your baby.
The PIPA urbn is a baseless infant car seat that installs using the advanced pipaFIX rigid latch. The PIPA urbn is not compatible with the PIPA or RELX base.
The PIPA Lite models are the lightest car seats in the world, while the PIPA and PIPA RX models are also lightweight at 8 pounds and the urbn at just 7 pounds.
Weight differences aside, the major difference between the different types of seats is that the PIPA versions can be installed with only a seatbelt for travel, while most of the PIPA Lite versions require a base at all times. Nuna's newest Lite model car seat launched in 2021, the PIPA Lite RX, is the only Lite seat that offers a seatbelt-only installation.