To make your TEEN sim( s ) have babies and marriage is: ( Before all of this make sure the sim(s) you use are/is adult(s) and have a husband/wife )

Steps:

1. CTRL + shift + c and then type boolprop testingcheatsenabled true and press enter. THen write boolprop testingcheatsenabled on and press enter.

2. Press any sim and click spawn, then keep pressing more until you see the words Tombstone of l&D.

3. Click the Tombstone and choose make me pregnant with, and ( Suggested ) your husband/wife.

4. After he or she becomes pregnant ( big stomach ) click the Tombstone again and choose speed up my pregnancy.

5. After she/he has had the baby, bring up the cheat box again ( CTRL + Shift + c ) and type Agesimscheat on. Press your sim(s) and click set age and set it to teen, child, or toddler.

And tadah! You have a married and/or had a baby teen, child, or toddler!