According to this Wyatt is the height of a 3yr old at 18months and Keegan is 1inch off the height of a 4yr old :-)
#baby milestones infographic
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Baby boys' average weight and height growth chart - 9 or 10 months around 20lbs it says http://www.babycenter.in/a1052194/baby-boys-growth-chart#ixzz2pNeFCN35