This is not backed up by any empirical evidence but is just a suggestion
based on observing not only babies but toddlers, preschooler and yes, even
teens.

Back in the days when I had only 3 or 4 children and worked full time
outside the home, I really dreaded that 30 to 45 minutes when we all hit
the house after work.  The baby wanted nursing, the kindergartner/first
grader was whiney and hungry, the preeteens were demanding homework
help/food/materials for a project and all that we adults really wanted was
about 30 minutes "down time" to unwind.  It was significantly better when I
began staying home after number 5, but still there was a coalescence of
angst when my hsuband came in from work.  While I would not label any of my
children as colicky (although number 4 came awfully close), I think this
"stress" or excitement may have something to do with the colicky symptoms
we see particularly at this time of day.  After all when you are excited or
stressed out, don't you get  "butterflies" and stomachaches and an urge to
scream at the top of your voice?

Just my .02.

Pauli Loeffler
Relaxing now with all 6 since everyone is fed and happy and it's nearly
bedtime for the younger ones.