Nathan really started to pack on the pounds during his second six months. It was during this time that his personality started to flourish.

He learned to sit up by himself...

and to take his first steps with a little help.

He celebrated his first birthday,

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nnd got to spend time with his Grandma and Oma.

During these months we learned out that he has his daddy's appetite,

and that he likes cars, planes, and trains.

NEXT: 13 to 24 months