you have to have both sims in bed then press relax on both sims!then the one that your not on press try for baby!but both sims have to be relaxing!then you will hear a wierd sound and that means you will have your baby!but you have to wait a long time before she has a baby!!!you will notice that she is throwing up and her tummy is geting bigger than she will wear different close!!!hop this helps!!!
i forgot if your sims are not married then you cant do it but if they are then you can and dont worrie when your sim is making wierd nioses and moning that just means your sim is having a baby!!!good luck!!