You don't go from an infant seat to a booster seat. You'll need a convertible car seat with a 5 point harness. A baby must be one year old AND 20 pounds before you can turn him forward facing. It is safest to keep them rear facing as long as possible though. Most convertible car seats allow a toddler to rear face until they reach about 33 pounds. Most convertibles will harness up to 40 pounds. Try to find one that goes up to 65 pounds, or even 80 pounds if you can afford it. The longer they're in the 5 point harness, the better. A booster seat can be used once a child is 40 pounds AND 4 years old. It is not safe before then. Ultimately, a car seat is your best bet.
at 9:13 PM on Jul. 15, 2008