you have to connect them, and make one eat honey/love potion.
the code to get the honey is : BCBACABA.
If you didn't know how to enter a code,
then I'll tell you.
go to shop, and press the A button three times.
then enter the code above.
the honey will make them kiss.
as soon as one of them takes it, connect them in some way (I use the present)
they will kiss, and in about two days, the girl will have a baby.
note that they cannot have a baby if they are to young.
EvangelineLyoko