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When we last saw "The Little Couple," Bill Klein and Dr. Jen Arnold were thinking about adoption. In the show's new season, which starts at 9 p.m. Tuesday, we'll watch them travel halfway around the world to meet their son.

Klein and Arnold, the local duo that stars in the TLC reality series "The Little Couple," both have forms of dwarfism - he's 4 feet tall, and she's 3 feet 2 inches. Last year, after struggling to have a baby, they decided to adopt a child who has dwarfism as well. In March, they brought home a 3-year-old boy from China they've named William.

"It's been quite an experience," Klein said last week. "We're learning as much as he is and soaking it all in."

The whole process - from meeting an adoption agent to bringing William home - will be chronicled in the sixth season of "The Little Couple."

Two episodes will air back to back. In the first, Klein and Arnold meet with a representative from Rainbow Kids, an adoption advocacy group. The woman pulls a photo from her briefcase, their first glimpse of the boy who will become their son.

"When we first saw him, we thought he had the most beautiful eyes and smile and looked like he was meant to be ours," Arnold said.