We might as well call 4 months 'the month we hear "those cheeks!" more than any other phrase' becuase oh my goodness people can't get over his cheeks.  Which I get, they are plump and squishy.  Ohh man he loves having them squished too, and if you play with his double chin he might love you forever.  

I swear he is the happiest baby around.  He is constant smiles and laughs,  he is such a joy to have around. He started regularly sleeping through the night, which has been awesome.  He wakes up at 8:30 smiley ready to start the day.