How do babies die?

[Devynn]

I was playing one of my family who has a bazillion kids, well 10.  Four of the kids are adults, and three have families of their own.  I was looking at the family tree and saw that one of the daughters gave birth, and had twins.  So a day or two later (in sim time) I had the girl's father visit the house to meet the babies.  When I got there I saw the two step-children and one of the twins.  I looked everywhere for the other baby before finally looking back at the family tree and saw the baby had been greyed out as if she had died.   


(the baby's father is selected in the tree so the step kids will show too.)

Searching the net the only answer I've found is the baby was taken by Social service.  Just to test that theory out I switched active households and "neglected" the other baby until a social service worker show up.  All the children were then taken away, and none were greyed out after.  The family tree still looks exactly the same after the kids were taken away. 

Since it was not the social service taking the little baby away, how do babies die?


EDIT: (because I despise double posts)

I figured out one way they can die.  My sims had a very good relationship with another one of their daughter's kids, and I got a notification that the little baby had died and how. 

[img width=600 height=375]http://img808.imageshack.us/img808/7198/burntodeath.png[/img]