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Originally Posted by canana  I'd say that in terms of physical size, they gradually grow up to about 1 year. Weight wise, they continue to fill out up to about 2+ years. |
Growth patterns will vary a little based on genetics. Filling out will be influenced by environmental factors.
My 2 boys are full brothers and they both had a late growth spurt at 11 months. They grew in height and length.
They developed muscle their 2nd and 3rd years, adding to their overall weight.