Quoting L☮J:" Normally in a seat that RF, FF and boosters, the booster portion will have an extended expiration date. ... [snip!] ... 3 in 1 seat that fits newborns really well is the Radian. Also, a lot of 3 in 1 or All in one seats make terrible boosters."
Quoting Jennybananna:" Get a diono rxt. 8/10 Year Expiration: The RXT has 2 separate expiration dates. When used with the harness, ... [snip!] ... the harness, the seat expires 10 years from date of manufacture. The manual specifies not to use the seat if it is in a crash."
Quoting Ah TAM:" i was thinking this also, they look too narrow for a bigger kid. i would really like one that i ... [snip!] ... like one that i can use for RF, FF (5 point and than the seat belt.) than buy a booster. (thats the right order right? lol)"Not sure what you mean by that.
Quoting L☮J:" Not sure what you mean by that. But comfort and value wise, you'll be best off getting a regular convertible, then getting a dedicated booster."
Quoting Ah TAM:" after they use the 5point dont they switch to (still sitting in the seat) but using the cars seatbelt? ... [snip!] ... the cars seatbelt? like the 3rd picture"booster seat". im assuming no back booster and one with a back r the same step?"No, you'll go from a FF harnessed seat to a high back booster. Kids need the support of the HBB til they're a little older.
Quoting L☮J:" No, you'll go from a FF harnessed seat to a high back booster. Kids need the support of the HBB til they're ... [snip!] ... seat, and they also have to be at a maturity level to sit in it correctly, ie no slouching, no falling asleep, no fidgeting."
Quoting Ah TAM:" got it. thank you. yes my DD it will take awhile just for the weight. shes still stuck at 30 pounds and shes 3 yr 4months. lol thank you for all ur help!"