Booster seat for 3 1/2 year old???

cayla

My son will be a little over 3 1/2 when our second baby is old enough to go into a convertible car seat...he is using the Graco Extend2Fit so he can continue rear facing until at least 3. He’s 30 lbs

My question is, is a booster seat with 5 point harness as safe? The minimum weight on this particular is 22 lbs but I’m still worried.

His graco turns into a booster but I was thinking of using it for baby #2 and getting him a booster seat to save money.

Of course, if it isn’t as safe I’ll 100% be buying another convertible. Any thoughts???