Britax

The BRITAX Combination Harness-2-Booster seats can accommodate children forward facing only in harness mode from at least 2 years and 25 pounds, up to 85 pounds. The seats can then convert to a belt-positioning booster and accommodate a child to 120 pounds.
Weight: 25 to 85 pounds
Standing Height: 30 to 65 in tall

BRITAX convertible car seats can be used rear facing from 5 to 40 pounds and forward facing from 1 year and 20 pounds, up to 70 pounds, depending on the seat. High-capacity convertibles allow your child to stay in a five-point harness through the toddler years.
Weight: up to 70 pounds
Standing Height: 49 in or less

BRITAX convertible car seats can be used rear facing from 5 to 40 pounds and forward facing from 1 year and 20 pounds, up to 70 pounds, depending on the seat. High-capacity convertibles allow your child to stay in a five-point harness through the toddler years.
Weight: up to 70 pounds
Standing Height: 49 in or less

BRITAX convertible car seats can be used rear facing from 5 to 40 pounds and forward facing from 1 year and 20 pounds, up to 70 pounds, depending on the seat. High-capacity convertibles allow your child to stay in a five-point harness through the toddler years.
Weight: up to 70 pounds
Standing Height: 49 in or less

BRITAX infant car seats can be used rear facing only from 4 to 30 pounds, and are compatible with the BRITAX CHAPERONE and B-READY strollers and other major brands with the BRITAX adapter strap.
Weight: 4 to 30 pounds
Standing Height: 32 in or less