Answer

Baby "A" is Little Monkey Man at 4 months old.  He was growing nicely at that point, but a fussy little guy.  Later we discovered he had quite a bit of tummy trouble due to my eating wheat/gluten.

Baby "B" is Sweet Pea, taken the day I posted it.  She's a pretty happy little girl these days.  We hope to not have the same weight gain issues/fussiness we had with Little Monkey Man due to me NOT eating wheat/gluten.

Many of you guessed right!  Good job!