Diane, I've noticed the phenomenon you are speaking of and I think it's
just part of everyone being different......some people are naturally tall
and lean and some are big boned and compact, etc.
 
I have two Mf, 1.5 yo, girls.  Fidget is loose and slinky and slender.
Fannie is solid and hard and compact (concrete ferret!).  I've had them
both since they were 9 wks old and their environment has been identical.
I think it's just an individual difference.
 
Now I have a question..... my kids are very, very quiet.  They
chatter/chuckle (I think this is dooking) and hiss (kind of a breathy
humming sound) only when they are in the midst of a very intense
chase/wrestling match.  The rest of the time they are completely silent.
I would love for them to be more vocal.  Is there a way to encourage them
to vocalize or is this just an individual difference, too?
[Posted in FML issue 2943]