As we all know, dwarfs do not grow like we do but instead suddenly evolve into the next stage of life. So instead of growing bit by bit, they magically evolve in less than one second - baby to child - child to adult (theory: probably because of their magical beer).
Problem with this:
Mother dwarf has a baby. Brings baby to play outside. Puts baby inside a small hole in the fortifications (where the archers can shoot through). Baby decides to evolve into child. As the child suddenly gets big, it got stuck in the hole - cannot get out.
Photo of the event (taken by our own dwarf photographer):
http://i171.photobucket.com/albums/u300/tenshiange/DF/childgotstuck.pngSecond problem:
The mother (still with her nurturing habit), tries to get the child out of the hole... with no success.... for a long time.
Summary if you don't get the story:
Baby dwarf turns to child dwarfs. I guess the system makes it so that the child dwarf starts to appear on a tile next to the mother dwarf (if she is holding the baby). Results in child dwarf get stuck (perhaps just if there was fortifications not walls etc.). Both child and mother then stops to move for a long time (half an hour of my play time). Do not know what will happen once the child turns adult (will post when that happens... unless it got killed first...)
Suggestion for future versions:
Script it so that when the baby turns into a child, it appears on the same tile as the mother.