Booster seats?

My son is 3 1/2 and weights 40lbs and is around 3 1/2 ft I'm just curious when you put them in just a basic backless booster?

Addy wont be in one for a few years. She's 4 and harnessed in the Nautilus. She's 35lbs and 43in tall. Much safer to be harnessed!!

We won't be using one for a long time. My son is 4 1/2.

Quoting Kelly +2 ERF/EH!:" Addy wont be in one for a few years. She's 4 and harnessed in the Nautilus. She's 35lbs and 43in tall."

  
except my Addi is 38 lbs and 42 inches tall. She is 3. When she maxes out her nautilus then I will move her to the booster. She still has 10 inches or 27 lbs to go.

Ok thanks idk the weight on mine I was just curious

Quoting Addi's Momma:"    except my Addi is 38 lbs and 42 inches tall. She is 3. When she maxes out her nautilus then I will move her to the booster. She still has 10 inches or 27 lbs to go."

Yep. When addy outgrows the harness, then we'll take out the harness and use it in high back booster mode.

4 and 40 lbs are the requirements but I wouldn't put my child in a backless booster at that age.

my daughter is almost 7 and she isnt in the backless one yet. I have her in the booster but it has a back on it.

At this rate he won't go into one ever my prosport car seat goes to 90 lbs harnessed

We never used a backless booster seat. My son sat in a booster seat from 5 till he was 10.