Genetics.

Now, I know when Luke was first born everyone was all, OMG Luke looks EXACTLY like Dave - and I totally agree.  Especially when Dave is holding him, their sweet faces look the exact same.  However, recently my mom busted out some old baby pics of me as well - and I think I do have some DNA in that boy somewhere.  Check out Dave and I's pics and then one of Luke. 

Baby Dave

Baby Kara

Baby Luke