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(9 to 18 kg) • Toddlers 20 to 22 lbs. (9 to 10 kg) who are capable of sitting upright unassisted may be forward-facing. If unable to sit unassisted, use rear-facing. • Toddlers 22 to 40 lbs. (10 to 18 kg) and up to 40 inches (102 cm) tall MUST be forward-facing. . Preterm or Low Birth Weight Infants A preterm infant or low birth weight infant may be at special risk in a vehicle or aircraft. According to the American Academy of Pediatrics, these infants may suffer breathing difficulties if improp