smacky and bucky

So, our youngest is four months old (coming up on five), and most of the time he's perfectly pleasant, happy, and smiling. But... he's developed this quirk: At night, he only wants mommy. If he wakes up and I pick him up, he realizes it's me and starts screaming like I'm twisting one of his limbs off. And night time is when mommy gets a break after being mommy all day!

It's just a stage, and I'm not taking it personally, but it royally sucks.